One point of complexity is safety in less accepting spaces. I am not saying that people who are bi have it easy, nor that they are more safe, but more heteronormative relationships tend to be safer to show in public because they are less perceivably queer by homophobic people without a gaydar. The bi besties are definitely queer and part of the community; I just wonder if the contention comes from people who have to hide/force/avoid relationships for safety purposes.