How do you deal with anti-vaxxers?

I’ll be honest, this is as much a question as it is a vent.

Specifically, how do you deal with people you meet everyday like family, coworkers, etc. who just revel in conspiracy theories?

I have a coworker who is dead certain 5G somehow produces the coronavirus, despite easily verifiable facts in microbiology and physics showing otherwise. He’s a nice guy in general with a degree in electronics, but dear lord, when he starts with this tin-foil hat bullshit it ruins my day.