Edit: I should be surprised to see the down votes for taking the time to honestly answer a question about my own feelings as to how welcoming this site is, but I'm not. Did you want me to say how wonderful it is here so far? It isn't.
So far my experience has been not welcoming. Down votes seem to be rather unreasonable and I often encounter a negative attitude against conventionally accepted and scientifically supported suggestions offered for the asker's consideration. Comments that follow don't come from the asker, but always from some third party that offers no constructive criticism or direct comment on why they believe an answer to be wrong. These are answers which are on topic and considered in the context of the question. I get the sense that people become emotional about topics not quite related to the question and feel the need to assert their opinion even if it's not the appropriate place to do so. For example, if you bring focus to the importance of a father figure in a child's life, somebody will inject a diatribe about how a single woman can raise a child and start flinging accusations at you about how you have disrespected every woman who ever lived. It's not fair to the person asking, the person answering, or child in question to derail like that.
Imagine you're answering on a food Q&A. "Which wine pairs well with steak?" You give a well thought out and researched answer about why certain red wines are generally paired with red meats. Then you get a down vote and the only thing close feedback in the comments is "How dare you! White wine can be good with steak!" Does that make red wine any less conventional or any less suitable as a pairing? No, it does not and it comes off as extremely silly and immature.
These type of nonsense comments can be exploited for any reason on just about any post here. "Citation required." Yeah on a parenting Q&A where parents are offering their personal advice and experience we should can an on-topic, helpful answer based on one user's failure to find elementary information on the topic? Nah. Nobody wants that. Please don't be obtuse here and ignore that I'm talking about people who displaying zero effort to contribute whatsoever. I am not referring to people who genuinely request additional information after making a valid attempt to find it themselves.
Maybe I've just had some bad luck with encountering trolls and they don't represent the general atmosphere here. For me it feels very unwelcoming to take time to try to help people and then have people on a parenting Q&A become negative just because I suggested that a child not having a stable home environment can result in the behavioral problems being asked about. That's been researched and well demonstrated so why does it inspire such hate? The more this happens, the more it feels less like a parenting Q&A and the more it feels like a site for attacking functional, healthy families. If this site is supposed to be some sort of single motherhood only Q&A the please change the name to accurately reflect this. If that's not the case then we need to be prepared to be more inclusive and encouraging to those seeking a healthy environment for their children. It shouldn't be a surprise that a lot of single moms don't actually want to be single and are literally praying for the support of a good man. I can direct you to plenty of real single moms on social media who want this. Thousands of them. There are, sadly, a large number of them and I hope I am wrong in my early impression of this site that the prevailing sentiment here is that single mothers should be struggling by themselves and that anybody here who shows support for or suggests ways in which they can build a more stable family situation is not welcome. Who here can really say they are against a healthy, nurturing environment for children? It's not fair to the community to say "Just because the child is in an admittedly unstable living environment doesn't mean we should address this issue which is likely the root of the behavioral problem in question." Why do we have this Q&A if we are not here to sincerely answer these questions? It really makes you feel like genuine answers aren't welcome.
I also don't really understand how down votes works on a Q&A where many things are a matter of opinion. Am I supposed to be down voting any parenting opinion I disagree with? That's the sort of thing that makes me afraid for religious posters who have religious aspects of their question regarding parenting. Sadly, when I see such a question, I am already bracing myself to see the user get attacked because somebody else has a different opinion.
To address the elephant in the room, I recently read this blog post and it gives the impression that the site is largely concerned with enforcing certain narratives which are often inconsistent, contradictory, and hard to follow. That's not very welcoming. The post is very much focused on select, but not very well defined, groups feeling unwelcome. It does not go into much detail about why they feel unwelcome or what SO is actually doing about it. Meanwhile, they are blatantly marginalizing everyone who doesn't fit into their cherry picked groups of people who's feelings matter. I'm not sure where the lines begin and end for those groups exactly, but there is a clear assertion that people not view as included in these groups are privileged and SO does not need to be as concerned with making these people feel welcome. It really sets a broad tone for the site as a whole.
As a user, I don't want it to be assumed that I belong to a particular group that is either the in group or the out group. I certainly don't want to walk on eggshells and withhold helpful answers because some other user imagines a suggestion of A to be disrespectful to B. I don't want to see somebody posting a genuine answer relating to a relationship between a mother and father derailed and attacked because someone feels that having a heterosexual relationship is inherently exclusive towards gay parents or something completely off topic. This is not meant to be the place for that. It is supposed to be a welcoming community for all and the effort to make it welcoming to some hurts the overall quality of the site for everyone. So I sincerely hope my experience so far has not been the result of this nonsensical group vs group social warfare that seems to derail just about everything these days. If you can't understand where I'm coming from on this one then it's time to check your perspective.
Before you smash that down vote under the assumption that I'm not a member of one of the right group or that I'm not of the right faith or that I'm not of the right political alignment and then proceed to tell me why I am wrong to feel unwelcome here, take a moment to reflect of what Jay says:
Feelings have no “technically correct.” They’re just what the feeler is telling you. When someone tells you how they feel, you can pack up your magnifying glass and clue kit, cuz that’s the answer.