For example, F1nnister identifies as a 100% straight male. He is not attracted to men and started cosplaying as a girl for jokes before continuing it because it was bringing him money in on streams.
Now, F1nnister is in a relationship with a transgender woman (see person in video caption). How is it that straight men are able to bring themselves to smashing out biological males if said male becomes passable enough?
In a related story, this guy rejected a man who had the hots for him. The guy decided to transition and later ended up in a relationship with him.
So again these situations are not isolated.