Answer: His focus is on culture and cultural diversity
Explanation:
He is trying to help students adopt a broader view of each cultural differences that we each possess without judging others for their own culture .
He wants them to embrace differences that exist amongst individual groups of people due to their different beliefs , customs and social behaviour.
He is probably encouraging them to not let these ideas separate them but make them unite even more as they share their different cultures hence embrace this diversity rather than shunning away from them.