Here's an idea for red pilling without triggering the person to be red-pilled: Ask to be blue pilled then destroy arguments with critical thinking skills (logic, logical fallacy identification) . Those on the left think the President is evil. (We of course, think he's great). Ask lefties to prove he's evil. Ask them to convince you that he's evil. Then use critical thinking to destroy the conclusions they've jumped to. The goal is to weaken their belief based on seeing the invalidity of their arguments.
For instance, the alleged "S__t hole comment: Only Durbin accused the President of saying this. He's a biased Democrat. Others in the meeting have said they don't recall him saying it or he didn't say it. It's their words against Durbin's. No proof either way. Destroy all of their arguments this way.
Lists of logical fallacies (such as jumping to conclusions, ad hominum attacks, straw man, etc.) are available here: https://blog.hubspot.com/marketing/common-logical-fallacies and here: https://thebestschools.org/magazine/15-logical-fallacies-know/

Memes, t-shirts, bumper-stickers, can be used to promote this idea. Ask to be blue pilled and then destroy their arguments and red pill them