On that flop with a small overpair, you have to decide to felt it or not. There are too many scary turn cards when you may be ahead or not. If you feel you are ahead, then jam it in there right now.
That is one of the worst played
I've ever seen. Usually their hand will be much stronger. Although
actually does have more equity than your hand at the moment, they should have bet and then 3-bet all-in. The small 3-bet is so awful for their hand.