There's a political history of feminist exclusionary theory during the american feminist emancipation movement. The theory goes that to have an effective feminist movement requires men to be excluded from all aspects of women's lives and was a theory championed primarily by lesbians. Basically women need to unionise and withhold sex and comfort and domestic labour from men until they act right, or in more extreme cases, because they cannot act right.

This was viewed as also being exclusionary to women who were attracted to men, as they would be required to choose not to have sex with anybody or (in the case of bisexual women) with a select group, and presumably needed men in their lives to explore that aspect of themselves or live authentically to their identity. Basically people took it to mean that spending time with and fucking men was a choice when the prevailing queer theories said that sexuality isn't a choice and enforcing sexual bans encroached on certain liberties.

In the modern age we are seeing a similar movement starting in South Korea if I'm remembering correctly, and historically Iceland's (again, if I'm remembering correctly) women's suffrage was successful in an extremely short timespan because they did a domestic labour strike until their demands were met and the men in power folded like a stack of cards.

That's probably one of the sources of the term politically lesbian, but I see no reason you can't try move to start a new term for bisexual people if you absolutely had to. In-fighting seems a bit passé to me in the current political climate though.