They usually represent the diverse people of our Planet.
Any preacher who has the Spirit of GOD in him, don't need to be told about the importance of this. You are talking to global audience and need to be very sensitive. Discard all the useless emotions and feelings. You are representing GOD, not your race, governments, countries or families. You must do what pleases HIM.

If the spirit of GOD is in you, you don't need to be told not to act so important, self centered, self-righteous, prideful, hateful, bitter, arrogant, crafty, in hypocrisy. You need to bring yourself low and let your light shine wherever you evangelize.

I avoid channels that promote only blacks, whites, Asia, Arabs, etc The atitude is likely a sign that the Spirit of GOD does not dwell in the communities, unless the behaviors are unintentional.
True believers are One family, and JESUS CHRIST Of Nazareth is our LORD.
Don't behave like the unbelievers. That is what they usually do — hating/dehumanizing & criticising others, but themselves and friends
The church is more important than your country, family and race. Humble your self and preach the truth without biases and hypocrisy