This has been the "go to" method of people like this who argue positions that rail against established science or history, from evolution to trickle-down to holocaust denialism. They cannot win on the basis of honest and sincere debate, so they play underhanded confidence games along with gaslighting in order to convince you to their side.

Honestly, if you are engaging in this, consider whether your side really is the right side to be on in the first place.