In my experience with regular everyday xenophobes, if you simply say that the only thing that is important to you is that somebody is a good person and all else doesn't matter, almost everyone will agree.
Fighting is usually counter-prodactive, most people aren't crazy, they just might be focused on unimportant things. Simply calm people down and bring focus on important issues, such as worker rights, corruption, self-organizing. Don't waste your time debating who should be allowed to participate in which sport competition.
This is how Trump won in the first place, wikileaks published emails of Hilary's campaign doing this. Instead of critisizing her for being responsible for Trump, democrats blamed Russia and attecked Wikileaks as Russian spies, literally called for shooting the messenger.
This is a prime example of why voting for lesser evil is not a tactic in politics and the whole liberal ideology as whole that we just need to vote for right people, instead of removing powerful positions in government in the first place.