King-high flush vs angry table coach

[deathpotato]

CO had been ragging on a fish about drawing out on him (it wasn't even much of a suckout) and I had managed to get him pretty angry by defending the fish's play etc. Up till now CO had been decent, if a little loose, but far from hyper-aggressive.

Paradise Poker 1/2 Hold'em (9 handed) converter

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, <font color="#666666">1 fold</font>, MP2 calls, MP3 calls, CO calls, <font color="#666666">2 folds</font>, Hero checks.

Flop: (5.50 SB) 8[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, UTG+1 folds, MP2 calls, MP3 calls, CO calls.

Turn: (4.75 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, MP2 folds, MP3 folds, <font color="#CC3333">CO raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">CO caps</font>, Hero calls.

On the turn I put him on a flush, 66, 33, 88, and maybe two-pair. Turn play looks seemed straightforward with the 2nd nut flush.

River: (12.75 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">CO raises</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">CO caps</font>, Hero calls.

On the river I'm getting nervous about the ace flush, but I there was a better chance that he was going nuts with a set or a smaller flush than that he had the ace flush. If he hadn't been so angry, I might have slowed down (is this right?), but as it stood I thought he could very well just be tilting away.

Final Pot: 20.75 BB

This hand was interesting for me because it brought up the question of what to do with an opponent who you suspect has just started tilting, and who might think you're trying to get into a pissing contest with him. Given the good chance that he is tilting here, is my play alright? Thanks in advance, comments/questions on all streets very much appreciated.