I watched it in German. Did they even bother to translate it?

Bully is definitely mainstream or at least was back then and, sure there are other jokes admittedly (that also weren’t very funny imo). I guess that part just left a particularly bad taste in my mouth. Seeing as Michael Herbig isn’t gay (afaik) it never sat right with me the way gay stereotypes were played for laughs by him. It’s just cheap and unimaginative. Of course humour and taste are subjective, but in my subjective opinion it’s just not funny at all.