That's a really important point that she's making about the homophobia.
There is very, very little difference between this and every straight dude who's ever described himself as a "male lesbian" har har har. The message is that lesbianism isn't a real thing. That a sexual orientation can be altered at will - in fact, that it should be. That a sexual preference can be bigoted.
I'm straight, but it's no leap at all to see how fucking horrific that idea is. Homophobic and sexist. If you said the equivalent to a gay man, you'd get the Owen Jones defence "euuuuuuuw, no, vag is gross, fuck off", and that would be that. But women's sexuality is seen as something that is more...malleable (i.e. a fair chance of a guilt trip working).