Real simple.
If you think some black people aren’t “black enough” or they are “sell-outs” if they don’t act a certain way or believe certain things then you are a racist.
And if you think republicans would openly support a black man because they hate black people then you are the racist.
And you’ve also just admitted that your argument has nothing to do with skin color and everything to do with ideology. And you’ve just admitted that you are willing to label someone a racist if they don’t conform to your narrow political ideology.
You are a racist.