A long time ago, I learned that there are people on the internet who won't recognize truth, and if you jump through the hoops they hold out for you, and just hold out more hoops, or when they make up their own rules concerning evidence, proof, or whatever, you can't ever win the argument, and if they're very good or you're very dense, you can't even stop trying. Some have a tenuous grasp of reality and some are deliberately trolling you, but whatever their intentions, once you engage, they own your ass.

You also won't ever convince somebody who's clueless and/or crazy enough to deny the Holocaust that they're wrong...because they're clueless and/or crazy. If you like hearing yourself talking to clueless, crazy people, keep on trying... forever. Because they own your ass.