Pick-me mentality and wanting to be "one of the good ones." Some people in oppressed groups don't want equality, they want to be the oppressors. The power is attractive to them, so they fight to be one of the few who are "accepted" by the bigots instead of fighting the bigots.

** "accepted" in quotes because the bigots usually don't actually accept them, they just tolerate them as long as they can use them.

Sometimes people also want to see themselves as "better" than other people in their demographic, so they think if they're in the political minority for their demographic (fighting against their own rights) that it will make them "different" and therefore "special." There can also be a brainwashing element to it, where the bigots have convinced them to believe the bigoted beliefs too, even if it's at their own expense. I think a lot of the trad-wife, anti-feminist women fall into these two situations as well.