2/4 3-flush board with top pair

[edge]

Stacks 400, 6-handed. Villain here is something like 50/17 pre and I don't have a handle on his post play. One fold to me with AQ and I raise to 16, one fold, Button calls, SB folds, BB (Villain) calls.

Flop AT4 diamonds, 50 in the pot. I don't have a diamond.

BB bets 21, I call, Button drops out.

Turn K offsuit, 92 in the pot.

BB bets 32, I raise to 100, he calls.

River 5 offsuit, 292 in the pot.

We have about 260 left, and he checks it to me.

I'm posting hands that seem fairly standard to me and it seems that a lot of people here don't agree, so I'm open to opinions.