You are talking all crap. If you go back 1965, there will be a lot of democratic policies that are racist today. If you go further back democrats were pro slaves, repubs were anti slavery. Its politics base will change overtime.
NEWSFLASH: its 2020 now. Talk about today. You are still 60 years behind. If you go little further back, Germans and Japs were conquering world. Do you treat them same today?
Its true there is some Repubs who are racist but what you need to do is compare both left and right and take what is right. If immigrant start taking over conservative leaning, those racist will be out. But you are afraid of fighting for what is right, rather you are aligning your self artificially with what they give you. You are doing awesome job at finding and creating reasons to support your given political beleifs by your master. Moral of the story is, its all politics it will change. May be in next 20 years browns will be repub and blacks will be dems. It never is about who is wrong who is right. All the Nepalese who are so much against Repubs are the one who are afraid that whites might reject them joining their parties. Its not anyone's, don't be afraid to go and take what is right. Don't settle with some treats dem might throw at you.