Anyway, to get back on topic, the gay community in general tends to hate bisexuals, and bisexuals are a largely invisible part of the gay community. It's pretty terrible and it's the reason I always strive to identify as bisexual even when identifying as gay is easier.
For example, when I came out to my mom, I was very tempted to say that I was gay instead of bisexual because people know what "gay" means. With being bisexual, a lot of parents seem to think it's just a phase, or hold out hope that you'll date the opposite gender anyway so they won't have to worry about it. My mom actually didn't believe that someone could be bisexual when I told her. The gay community doesn't help this perception because they do things like this, wherein they paint bisexuals as non-gay and exclude them.