If the flop were more draw heavy i think we could put a lot more air into his range by the river. The only real draw is 56. If he did take a card off i think he would def try and bet the turn larger as a bluff on the turn. Some stats on this guy would be really helpful. I do honestly think this guy is just frustrated that he couldn't build a bigger pot with what he had and spazzed out and shoved. AJ is also a big part of his range along with sets which would play similarly on the turn.

Still think this is quite an easy fold.