Maybe I just suck at poker, but I can't see how you can fold it just because the board paired and he moved all in. Does the guy really have the full? Im pretty skeptical, although I might put him on trips for the river.

Also, it seems like people advocate heavily for folding with anything but the nuts when the opponent is aggressive.. doesn't this leave a hole in your game which is heavily exploitable by the opponents, not to mention too weak to be comforatable with?