They shouldn't be, and in this case I honestly don't see how they were since other issues of bisexual people never even came into discussion. Just because someone points out a specific issue a within group of people it doesn't mean they're saying every person of that specific group is like that(ie when women criticize guys they are obviously talking about the bad apples and not every male). Whether they happen more or less I really couldn't say. Honestly though, it's kind of funny that just like you understand and can't blame bisexual people for this, I also understand and can't blame gay people for being selective about their dating preferences, oh well.

Those were not examples of anyone actually saying that. Those were examples of people claiming they've seen it, and one idiot using the word "heterophobia".

This is nitpicking. You asked who says it and I pointed to you someone who said it. Their idiocy is a whole different issue. As for me, this happened in a IRL event so there's not much proof I can give you other than my word, if you don't want to take that then I understand. But the heterophobia idiot is still there, and he's still saying exactly what you are denying people say.