in accordance with the wise adage "polling is bullshit," i'm gonna have to fact check this one.

The source is a Glamour magazine article. The "study" was conducted by Glamour itself. Almost no information about methodology is shared, including how respondents were located and contacted, what their demographics were, or what the actual questions being responded to were. All we are told is that they polled "1,015 women ages 18 to 44 about their own sexual identities and experiences." Needless to say, this is not a representative sample, and I strongly suspect these were Glamour readers responding to an online poll.

I don't doubt that biphobia is widespread, but I want harder evidence.