Sounds like a mismatch.  If my son brought his social justice warrior girlfriend into my home, and she then proceeded to police my family and me for all manner of political incorrectness, my son would be presented with a very stark choice: get rid of the SJW girlfriend, or be disinherited and permanently shunned, whether the girlfriend lasts or not.

It's pretty simple, really.  Busybody girlfriends aren't the only ones with leverage, and the current cultural war is a total war without room for compromise or compassion.  Most young men, if presented with a choice between food/lodging and really bad sex with an ice princess, will choose the former.