When stereotypes make people uncomfortable, it's almost always a class of people viewed as commonly persecuted and usually a heavily US-influenced culture pointing it out. As the poster does not mention skin colour, we can assume it is white (given the US-centric context). As such, it has to be a Jewish stereotype. I am basing this on the fact that the discrimination that makes US citizens uncomfortable is generally against jews or black people. There is a certain segment that thinks discrimination against white people is an issue, but there are no dogwhistles to indicate that (and I'd assume skin colour would be emphasised more).