I don't really like the flop bet. What are we repping? Not 99, and we shouldn't have any 3x in our range here. So this looks like air, flush draw or a weak pair, all of which hate being raised. We have showdown value here and flop isn't exactly action central for a 3bet pot, so I don't see why we can't just c/c flop and reasses turn.

Why is button's sizing fishy? He's stealing at x3, pretty much standard.

Pre flop I think calling or 4betting are both viable, I probably call but it depends just how fishy I feel the button is. Did you see how he doubled his stack?