judement for dating outside my race

How do I deal with my family judging me for dating outside my race? I’m white, my whole family is white. My cousin is married to a black man and certain family members have made rude comments to them, he wasn’t allowed at thanksgiving dinner bc my grandpa refused to have a black man in his house. And some family didn’t go to their wedding just bc she married a black man. The guy I’m entertaining a relationship with is part Mexican. I really like him but I’m afraid of him being treated poorly by my family just like my cousins husband. Growing up my dad always told me he would hate if I dated outside of my race. I never understood the big deal, even as a young child. The way I see it, if I’m treated well and I’m happy then I should be allowed to be with whoever I want. I would definitely get rid of the judgmental family if it came down to that, but what can I do to help them accept him before it comes to that? I honestly can’t even see myself with a white guy, even if it doesn’t work out with this guy who I’ll potentially be in a relationship with. We’ve both talked about being together, but are taking it slow.