It's the literal definition of bigotry - a general dislike of a large group for reasons that have nothing to do with anything that group can control, or anything that applies to all members.
Actually the definition of bigotry has nothing to do with whether you can control it or not. In fact, the term bigot originated with hating heretics and foreigners: http://en.wikipedia.org/wiki/B...
It can apply to anything from "I just don't like republicans" to "I just don't like religious zealots" to "I just don't like rich people" or "I just don't like Americans" or "I just don't like nerds". Blanket dislike of groups of people exists all over the world, many times for things out of their control. Often it's because of behavior exhibited by their group. But that could be applied to homosexuals as well, at least of the flaming variety.
I also find it odd that you believe you can just easily choose your personality/political views/religion (particularly personality). Alot of that stuff is really baked into a person through their life experiences. You can't just wake up one day and "be different" with the flip of a switch.