Like most here, I do my utmost to avoid arguing with Trumpers. I rarely have to interact with them, thankfully. But I’ve occasionally been a captive audience of one who just will not be deterred.
The only tactic that has brought me a measure of respite is to turn the discussion back on them to justify their positions. I don’t let them “whatabout” or dodge their “reasoning,” such as it is.
Conversations have gone like this (I never start them):
Trumper: “The libruls stole the election from Trump!”
Me: “Really? How do you imagine that happened?”
Trumper: “There were millions of illegal immigrant votes counted!”
Me: “Huh. How do you suppose they accomplished that? I thought there were Republicans involved in the vote counts across the country. How did those good Republicans not obtain evidence of that?”
Trumper: “Well, the libruls were slipping votes in the back door under cover of night, so the Republicans didn’t know.”
Me: “Gosh, that doesn’t sound likely to me. Why do you suppose we have to register to vote and have our signatures matched and be ticked off of a list when we vote? What’s the purpose of that if votes can just be slipped in the back door late at night? And why would the elections officials count them if the votes couldn’t be verified as legitimate? And why wouldn’t the Republicans show the evidence of this to the courts if the elections officials ignored the voter match requirements? Say, since we’re on the subject of courts, why do you suppose all those judges across the country dismissed all the cases against Trump, even Trump judges?”
Trumper: “You’re just brainwashed by librul media.”
Me: “Am I? Can you show me a single article from even your own news sources that says Trump won more than 1 minor point in an election fraud case? I’ll be happy to read it and factor it into my opinion. Or are you saying no news source can ever be trusted, ever?”
And so on.
I don’t expect to persuade any. But at least it gets them to think twice about trying to engage me again.