Foids like attention and validation from other foids, Chads and normies.
They like to "make a scene", be the center of the attention.
If she was just kissing an ugly dude in the subway no one gives a shit. Now thing about two lesbians having a hot kiss by your side on the subway. Everyone would look at them.
Also, the lgbt/gay agenda is stronger than ever today. ((Them)) have been pushing towards that kind of degeneracy for a few decades now. I think you are looking at the small reasons and overlooking the big reasons.
Yes Incels/ugly guys are undesirable. Those foids want facebook attention, twitter attention. And being with a straight white male will only make your ((masters)) say you are a bigot homophobic. So the foids kill two rabbits with one stone, by being with another foid they get "tolerance points" and attention/facebook likes.