If you want to argue facts with a Trump supporter, good luck. If you want to drive them absolutely up a wall, tell them you won’t be voting for him because he wears diapers and smells bad. Keep hammering on that point and nothing else. Argue calmly with things like “everyone knows he wears diapers” or “look... if you want a president that smells bad, go for it, but no other president in this country’s history has ever smelled that bad. That’s a fact!” Try it. The reaction is priceless.