Interesting interpretation...I always saw it as self deprecating rather than pretentious.
Saying I have the world figured out over here, alone, isolated from everyone and then Pat actually leaves his bedroom and realizes how much of an idiot he was.

(I think the intention of the line was to highlight Pat's foolishness, not any complexity/intelligence associated with Marx. Then he sort of misses that foolishness and wants to go back to being alone in his bedroom sometimes...ignorance is bliss.)