As a non-white I call shenanigans. My non-whiteness is very obvious in my SO profile pic and not once in 8 years of active use of the site has it ever come up, nor have I perceived being treated any differently. Also, no one ever asked me if I felt “unwelcome” nor is there a button to click for that, so I don’t know where this really comes from...

Finding material that is off topic but preserved for some reason is often cited as a negative experience. The "I searched for XYZ and it was closed as not constructive" (note: not constructive hasn't been a valid close reason for several years).

This brings up the question of "should that material be findable on Stack Overflow if people are having such poor experiences when finding it?" and "are people finding the closed questions of yesteryear a disincentive to participate today?"

The finding things closed as a duplicate sign post isn't working as intended with redirecting them to the proper question - because when there is an answer to the question (that may or may not properly answer it) it prevents the logged out user from getting redirected to the duplicate.

The negative experience is that the interesting/useful questions/answers aren't rewarded.

It's bad that they are closed with harsh and false ("not constructive" on some of the most useful question there was...). It would be even worse if they were entirely removed so we couldn't find the answer.

This particular argument is really bad IMHO. OP has a point - nobody knows who you are. That means if some people feel they are treated worse it is due to their own perception. After all, objectively they are not treated worse then everybody else. Which to me sounds more like a bias in their perception. They may have that perception for a reason, but that does not seem to me to be something attributable to SO.

Is it a fact? I'd like to see the evidence behind that claim, so I asked for that: https://meta.stackoverflow.com/q/366692/41071.

But not marginalized groups also tell them. Now the question is who tells more? I think marginalized, because they read all these blogs and tweets about being opressed, shift their selective focus to minor injustices, and feel empowered to complain. The SJWs are the complainers, they are the warriors, that's why you hear from them more than from anybody else. They have the momentum of complaining, so they are more likely to continue to complain. I'm certain most of them are addicted to complaining and will never stop, no matter what. Also, minorities have higher social status within those ranks, and therefore more likely to be SJW.

So it's not necessarily Stack Overflow's fault at all.

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.

That's an anstoundingly lack of emapthy and self-awareness. Also extra points for the unironic use of SJW.