About "Dumbo," we started to watch it once and DS#1 (3yo at the time) was very upset and scared by it (his mother is in jail, etc.) We've found a lot of Disney movies to be like that, so we don't watch 'em.
Now on topic, it's so hard having unsupporting grandparents. My folks think we're nuts, but they've finally decided that we've made our own bed, we get to lie in it (and the fact that said bed is futons pushed together on the floor & crowded with 2 adults & 3 kids ... well, they roll their eyes at us a lot). We're lucky they've mellowed.
If parents are pulling away because of it, I'd push the relationship without pushing the issues. After all, you only get one set of parents, and nobody on Earth is getting any younger. Maybe you initiate contact, but let them know that if AP lifestyle choices come up, the conversation ends.
I know a few folks who've broken off relationships with immediate family members over all sorts of issues, and when somebody eventually leaves the world, everyone has regrets ...
and those kinds of regrets ... well, it's not worth it. So even if they push away, my advice is to at least minimally keep in contact, as hard as it might be sometimes. And when you can't deal with the conversation, say the soup's burning and hang up. Peacefully and pleasantly.