How do you deal with bisexual erasure?

[Giovanni]

I just got out of this twitter war with a couple of ignoramuses, stating that a guy, such as myself, cannot be bisexual, which I am, and that he can only be gay. After that little war, I honestly couldn't fathom how some people can do it all day.

[Sam]

Just tell them that they aren't in your head, so how could they possibly know what you're feeling and who you are attracted to? If they say you are confused, tell them that you're not, and they seem to be the ones that are confused. When people say bisexuals are real and bisexuals don't exist, etc. a humorous favorite of mine to reply is, "Nah, bisexuals don't exist. We're just incredibly sexy hallucinations." It's quite annoying and sometimes infuriating, but I try to inform that we do exist, and sometimes you just have to let it go. If all else fails, at least you have other bisexuals and non idiots who know you exist.