Because, in general, those who like to point out that someone is Jewish are the alt-right. And they don't point that out because they love Mel Brooks movies and matzo balls.

Eh, it is what it is. I am politically liberal, all for BLM/LGBT marches, equal rights, believe white privilege is a real thing, etc. Voted for Sanders. Still getting downvoted because the mere mention or skepticism of how privilege is applied attracts the usual attention.

As far as I can tell, my Jewish friends are considered white when they are referred to regarding privilege (by the left) and a minority by the alt-right. They get the worst of both worlds. Asian-Americans get it on a similar, if lower level.