The main problem I see here, is raising 6 dollars preflop with AQ out of position on at least a couple possible callers. I believe I play more conservatively preflop than many, but I just don't like building a large pot for a hand like AQ that doesn't really have a whole lot of big hand potential beyond TPTK.

By raising 6x and a caller, you make the pot so large that making a pot sized bet at this point (which is probably the correct play) basically commits the rest of your stack with just a pair of queens. And this guy DID call a 6x preflop raise cold... he could very easily have KK or something of the likes.