200NL - Sucky river spot

Opponent is 22/6/1.9 and I was totally lost here. His line is so weird, comments on all streets are welcome
$1/$2 No Limit Holdem
9 players
Converted at weaktight.com

Stacks:
UTG ($206.90)
UTG+1 ($47.00)
MP1 ($43.55)
MP2 ($98.00)
MP3 ($297.70)
CO ($225.15)
Hero ($476.85)
SB ($213.80)
BB ($50.80)

Pre-flop: ($3, 9 players) Hero is BTN :4c: :ac:
3 folds, MP2 calls $2, MP3 calls $2, 1 fold, Hero calls $2, SB calls $1, BB checks

Flop: :6c: :7c: :qc: ($10, 5 players)
SB checks, BB checks, MP2 checks, MP3 bets $8, Hero calls $8, SB folds, BB folds, MP2 folds

Turn: :6h: ($26, 2 players)
MP3 bets $22, Hero calls $22

River: :ah: ($70, 2 players)
MP3 checks, Hero bets $44, MP3 raises to $100, $56 to Hero ($400.85)?

i suppose he could have aq or have flopped a lower flush... i want to push, but i think we have to just flat it.

Jesus raise the flop and raise it huge. As played just call the river.

I prefer to raise the flop. Against a set we'll stack off, against a lower flush we'll stack off, and against two pair we'll often stack off. Allowing a lower flush to see a free card kills our action when a club comes, and allowing a set or two pair to see a free card loses a lot of value. We're not getting an overcall here on the flop unless it's from the bare K :c: (which is going to be rather rare here) so there's no real reason for a call imo.

As played, I think turn and river are correct assuming you called river raise.