Assuming young white males think the same thing. They had to bring age, race, and sex in to decide what they assume the political beliefs are of the majority of the site.
“all young black males are like this” <- is this racist?
“all young white males are like this” <- is this racist?
Nitpick: xoxoy's claim was "most young white males are like this", not "all".
When someone tells us what they think, and we dismiss it by saying that's exactly what someone of their race would be expected to think, that's racism in one of its worst manifestations.