Not the original commenter, but once I asked a small question when I was starting to teach myself Java (something about calendar not returning what I expected and me not understanding the documentation, but I can’t quite recall the details).
I got 9 upvotes and a few helpful answers, but the only thing i can clearly remember is one answer that said unless I had a severe learning disability I should understand the documentation and not ask (r-word) questions.

I didn’t understand it because of a language barrier since I also had to teach English to myself at the same time. But that comment really hurt me for some reason. It was just unnecessary rude.

That answer eventually got removed but the first time I flagged it I got the response that the mod could not see anything wrong with the answer.
But it wasn’t even an answer! More like a comment, but even then completely unnecessary.

Before that I really enjoyed the site, answering js and PHP questions, helping out a bit with formatting on other people’s questions or answers etc but ever since then I go there rarely and only if I am looking for something already answered.

Honestly I have a question I answered myself and was up for over 10 years with hundreds of views and votes only for the question to be marked as a duplicate for a question that verboten has nothing to do with the question I asked. Specifically I was working with canvas and svg and the question linked was neither thing. The other question is also 5 years newer so even if it were the same it would be a duplicate of mine, not the other way around.

Another one is a very high rated answer I gave was edited by a big contributor to add a participle several years after I wrote it and then marked as belonging to them now