It's always tempting to debate bigots about their bigotry, but honestly the best thing you can do is often to directly help those affected by said bigotry.

Bigotry doesn't exist to be debated. People who are bigots do not care about debate - they care about humiliating their opponents. You cannot outsmart somebody who doesn't give a flying fuck about their position being incorrect. You will be playing a completely different game by trying to debate somebody out of their bigotry.

The best thing you can do is to show up for the marginalized. Check in on them, talk to them, and engage with them as people. Ask them if they would like help and then respect their answer to the best of your capabilities. Oftentimes, that will be sufficient enough and will go a long way.