What's the logical fallacy called, I can't think of it?

This is a bad example but to illustrate a point, let's say you're gay and you talk about a hate crime that happened to you, someone else comments and says "I got robbed by a gay person once, (something generalized like that) and I'm just saying that some are violent."

Then they hijack your post with talking about how some gay people are violent (as if that's a valid point) when the original story was talking about how you had a crime done to you.

They'll go on to say that they've witnessed bad behavior among people and they'll say things like "I'm just saying" and "you're hating on all straight people."

Then instead of the original point being made, they'll continually do it.

It's a bad example but it's to highlight a certain mentality that some people have that their minds can't focus on something specific but even the mere mention of the group will just bring up generalized notions so badly it takes from the original point.

I'm sure that's a fallacy but not really sure what it's called.