This was you simply one day ago in /r/AskReddit:

the holocaust..sorry "holohoax. The fact that such a rubbish lie can be held onto for so many years is baffling.

The Holocaust happened and whatever your Neo-Nazi friends over at IHR might believe, there is no argument from their side which can not be debunked. Start with the Nizkor Project if you genuinely want to know the truth.

Oh, and, of course - Holocaust denial is an insta-ban in this subreddit. Enjoy!