What kinds of things are you guys okay with disagreeing with when it comes to your boyfriend/partner?

I only ask because my current boyfriend, who I really really love very much, and I don't agree on a few things, and while I get that it's normal, and you won't always agree 100% of the time, there are some things I think are too important to just ignore. The example I can give, is that he has no problem with Trump, and I absolutely loathe that despicable yam, but he says it isn't a big deal. Should I just let that go and accept it or what?