When to shut up vs. speak your mind?

Most of my family and I are about as different as you can be... my Nana truly believes being gay is wrong, thinks its disgusting, and my mother is very quick to make judgements about people she has never met based on their skin color. They think its hilarious to talk/joke about shooting people they disagree with, etc. They believe if you’re poor its your own fault and you deserve 0 help.

At family gatherings I have always kept my mouth shut when my Nana, mother, Aunt, whoever, etc. goes off on one of their rants. Lately I feel like I’m just doing a diservice to myself and vulnerable populations by not speaking up. If I don’t speak up when its hard - how will we ever change the culture? They already know I don’t agree, but it sucks to just sit there and listen to them go off on these people.

Do I just stop attending? Speak up? How do you guys deal with this in your families?