I had some gobshite try to argue a more pretentious version of "I think, therefore I am". Basically was that if he thought something was true, it *was* factually true and it can not be contested, along with people having free will etc. Subjectivity simply didn't exist, nothing conflicted. He also claimed that irrationality does can not exist, only appears irrational if you're not intelligent enough to deciper it etc. etc. etc.
Despite hours of us spewing shit and the odd "you're a retard" towards me, he pulled the QED bullshit and fucked off. If anything he only proved that he had some weird god-complex and in general a complete cunt. It was fun, though.