I think it's possible that he either A) Doesn't realize how aggressive (often passive aggressive) his posts are perceived by most or, more likely, B) Perceives any post that challenge something he said as a direct attack on his intelligence and/or honor.  He seems to consider his own opinions facts. Therefore other peoples opinions must be 'wrong', and he must prove them wrong, otherwise it will appear that he is wrong.

Or he might be just a troll I guess.  But I think B or A is much more likely. 

Gonna go prepare myself mentally now for all the mean things that are about to be said about me.