I sometimes act blatantly racist around my semiracist dad to see what his reaction will be
What are you hoping to learn from acting racist around your dad?
I want to confront my dad about his lack of acceptance about black people
Putting out racist expressions under any circumstance is incorrect and wrong. Confront your father directly on his racist views and don't try to use racism to combat racism.
I really want to know so that I can expose him. I guess I won't have to if he acts cool about it, but if he gets pissed, I have a lot of ammo.
It is good to want to know the beliefs other people have but by acting racist you could be using bad language and using stereotypes which is wrong. A talk is a better thing to do.