Stan is correct that the basic problem for deniers is that millions of Jews disappeared in Nazi custody - in the camp system - during the war, and there is no record of them leaving the camp system. The mainstream hypothesis - supported by tons of evidence - is that they were killed.
The denier alternative hypothesis - that the Jews were transited out of the camp system into some permanent settlement - has no evidence, which is absurd (as I have said, a settlement of millions of people in the 1940s - really a nation - would leave some physical or testimonial or economic evidence of its existence).
My father once told me that you are a sucker for being nice to someone who is being nasty to you, and I have generally followed his advice. But for some reason I cannot help being friendly to you, which is quite odd indeed given how intensely you have vilified me. I guess I have always been a fan of smilie emojis.