I believe this has been rehashed on MSO so many times after that blog post that there are 2 cases:
1. New users feel unwelcome because their questions got closed
2. Users feel unwelcome because of races/gender commentary
Users from the 1st case were more vocal with "This is why I hate SO" blog, but the community doesn't feel like the need to "clean-up" the posts by VTD it, because... there's no point in cleaning them up (after all, there's roomba). In the end, it's known to the public and the community that SO feels unwelcome to low quality posts (and.. is that an issue?).
OTOH, users from the 2nd case seems less vocal until the April case, and the offending comments were also cleaned up ASAP after that case. In the end... the community couldn't see if the claim was true or not; only mods and SE staffs. So, most of them don't know if some SO users feel unwelcome due to that.