[gordo16]

I think you have to insta-fold to this river bet. In this spot, I think that you are only going to get shown a hand like 456x that was just trying to hit a gutshot and really looking to bluff any scare cards less than 10% of the time. The bet is one looking for value. I wouldn't be surprised to be shown anything in the range of 55xx to a mid-range flush. It hurts to lay this down in a big pot, but I think that in this spot it's a must. To avoid getting into these sorts of situations, I would recommend not flipping your AAxx hands face up preflop when there are still deep stacks at the table. It is for this reason that you would seem "exploitable" at the table, not the fact that you make this river laydown.