If you insist on referring to bisexuals as people who reinforce the gender binary, you are being biphobic. Even if you think you’re cute and polite about how some of us have come to Jesus about non-binary genders, you are not avoiding that problem. Why? We aren’t the ones who set up the binary. We are not responsible for the original definition of bisexuality, either. That was coined by a heterosexual psychiatrist over a century ago.
So really? If you think you can attack bisexuals over the gender binary, you can sit down and shut up. It’s not our creation, and it’s not something we choose to maintain save when we as individual bisexuals may contribute to erasure of non-binary genders. The collective bisexual community is NOT responsible for the binary structure of the English language.