Family doesn’t like my bf

I’ve been dating my bf for a couple months now and I’m falling for him hard. Only problem is my family isn’t too crazy about him. They’ve only met him a few times but I’m close with them so it’s hard knowing they don’t like him. When I ask why they don’t really have much to say other than he made a sarcastic comment to me one time (I’m really sarcastic so I don’t see this as a problem) and one time when we were out with my sister I walked on the outside of the road which she doesnt like. Things are getting serious between us and we’ve been talking about moving out at the end of the summer but I know they won’t approve. I’m 25 so I know the decision is mine I just wish they weren’t so judgmental. Any tips on how I can get them to like him more? I feel weird gushing about all the nice things he does for me and our schedules don’t really allow for us to spend more time with them either.