The funniest racism is the racism between minorities. It's something you don't see dramatized, but almost every minority I know who's my age, they have these funny stories about their parents stereotyping other minorities.
You want to try and bring a character to life in an honest a way as you possibly can. It doesn't matter whether he's a doctor, an actor, a car salesman or a captain of a starship. If you can bring truth and honesty to that character, then your audience will believe you.

