How can I stop my ex wife and her disgusting husband from being racist?

My ex wife came to pick up our daughter from a visit. My girlfriend is from Colombia she is beautiful I think my ex is jealous. I hate her husband.

My ex wife's husband had the odacity to ask my girlfriend if she has a visa later went on telling my girlfriend that she must do things then correct way. My girlfriend has live in America ever so nice she was a child. The racism it's just stupid!

I suspect my ex wife and her husband are white supremacist? Yes my ex wife and her husband are racist clowns and making hateful comments about my girlfriend. Why?

How can I stop my ex wife and her disgusting husband from being racist?
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