I'm going to call my friend a racist
Why do you think that he is a racist?
Because he disagrees with my point of view
It's not right to call your friend names when he has given no indication that he has done anything wrong. Disagreeing with your point of view is not being racist. Be careful what you say, because you will start a fight by accusing people with no evidence.
I can't deal with this anymore, I'm calling him a racist.
I think that this is going to end in a way that leaves you both unhappy. I think that it is wrong to call your friends names, especially if they are unjustified.