When people here say they hate bisexuals, what do and what kind do they mean?

Also is it a sort of irrational response? Say you get dumped by another gay person. "Sucks, but kay whatever." In opposition to getting dumped by a bisexual whose next partner is a girl: "Omg, all bisexuals are bad! I will never do anything with them again ever."I mean what happens after he dumps you is kinda irrelevant imo. I think this is just venting, which is fine, but I think to let it get to you so much is not.Anyway, before my original question gets drowned out: What kind of bisexuals do people have these experiences with.I once had a discussion with someone and what quickly became clear is that one single label can't possibly accurately describe a person.