Don't be arrogant. You ability as a teacher has nothing to do with your race. Don't get your ethnic background mixed up with teaching ability. You sound a little too proud....in a very arrogant sense. Let me bring you back to reality, there are many great teachers with many students who enjoy their English lessons. There will always be other teachers in the world with move talent and better teaching skills than you. So don't be too proud Mister.

Racism exist in all the world. Even in the USA, so the African Americans have not conquered racism and they never will unless the government becomes socialist like Cuba's.
Racism exist also for "white" people. Do you think it is easy for a white Anglo-Saxon person to be an ESL teacher in Pakistan, Egypt, or Saudi Arabia...? Guess what, it is also difficult. We face alot of racism too, not just "blacks" but also "whites". I guess every country and culture has it's preference of foreigners they like to cooperate with.