[EPiPeN11]

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I dont understand the flop play ... this hand seems like spew to me

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He should fold out KK, QQ, JJ, AJ or worse. Folds out AQ some of the time. AK, AA and a 2pair/set are the only hands that call and all of these hands are more unlikley due to an ace hitting the flop as is. Most people also don't squeeze with 77/55, they call for set value.

EDIT: I didn't see that he bet for like 1/3rd of the pot, I prob fold, a lot of times he has a monster and is milking you. If he had bet 1/2-2/3rd of the pot I would like it a lot more plus there is even more money in the pot to win and his hand is more likley to fold esp since your line looks stronger too and his hand is prob weaker.