to find out the extent of their childishness- al one has to do is tell them “My Goodness but you are childish”- that will set them off big time- another good tactic is to show ample proof that what they spew is lies- they get enraged then=-
I offered $1000 cash for video of Trump saying "Nazis and White supremacists are fine people" or words to that effect.
I would say "You have a phone. You know how to use Google. Take all the time you need".
Twists their heads right off.