re: Poker & $2 NLHE Full Ring: Preflop fold AKo to a reraise
Defeintly don't fold pre flop.
His BTN range is going to be slightly wider even for a nit, you can't just muck and say QQ+, what about dominated hands he could quite easily be doing with?..It could be also a 3bet bluff on the BTN, given HIS image, he might feel it's a good spot to 3bet bluff.
If you flop top pair, chances are you're good or at the very least; splitting vs his A,K. He might be the sort of nitty fish who can't fold JJ/QQ/KK on a ace high board and be stubborn and just get it in, chances are he will also get in worse aces after 3betting pre, (A,T/A,J/A,Q etc)
Also; you haven't told us something which I think is quite relevent; previous hands and your image is actually really quite key here. He's a nit, but if you have been steamrolling (you have a 200bb stack, been running good or just hammering the table?) he could be 3betting like I say, much worse hands, lots of broadways and of course there are pairs he might be 3betting for value vs your CO wide raises.