As usual, you have over complicated the situation, used too many words which you don’t understand, confused yourself as a result, and then screwed up. This is your defining characteristic, it crops frequently and it probably stems from a low intellect, but a desire to outwardly appear bookish.
Denier is a perfectly correct term in the context in which I wrote it, and it is one which appears in, amongst other dictionaries, The Oxford English Dictionary. It means to deny something and you were clearly unaware of this meaning. In fact, you are completely wrong, denier has no roots in slang at all, but you are not a big enough person to admit that. You are in fact a rather pathetic weaselly person with nothing Interesting or relevant to say.