The only information we have from the blog post is that Stack Overflow has survey results telling them that marginalized groups feel particularly unwelcome, unless you have some other source of info I didn't notice.

From that single datum, you've concluded that this is because marginalized groups must over-complain, and in fact, you claim to have achieved perfect certainly that most members of marginalized groups have an addiction to complaining and will never stop, and therefore the only sensible course is to completely disregard any survey results saying that marginalized groups feel particularly bad about anything.

That's a pretty strong conclusion from hearing about a brief allusion to the results of a survey you didn't see. Your argument says a lot about you and very little otherwise.