Commerce 40. Villain (HJ) is really, I mean really bad player. Asian man, ~60 y.o. He limps ~75% of hands, almost never raises including AT type hands, cold calls pretty much with same range. He runs bad, losing a lot and definitely seems to be annoyed that I iso him frequently. He is passive overall and almost never bluffs, but I did observe him taking dumbly aggressive lines in a couple spots, all involved donking a made hand and then barrelling when turn/river clearly improved his opponent's hand. He also donked draws a couple of times, but I never seen him showing complete airballs. He pretty much never check raises, donking out is his preferred line for any ocassion that needs aggression/initiative from his perspective. He seems to be playing over his head and hates losing money.

HJ limps, Hero raises red 55, blinds call, HJ calls
Flop(8sb): A32r HJ donks, hero raises, blinds fold, HJ 3!, hero calls
Turn(HU, 7BB): A HJ bets, hero calls
River (HU, 9BB): 7 HJ bets, hero ?

Now, a little nuance is that my notes on the hand show that blinds folded before the flop, and then again that they fold on the flop - so I can't remember for sure - pot could have been 1.25bb smaller during the hand, compared to what I posted

I fold the flop if the blinds are still in. I call river as played. River seems like a no brainer if you get there. Old, tilty, terrible, we have a pair. Cant imagine folding under these circumstances.

I don't agree with the flop call... we have enough good outs when behind, IMO.
As to river, what do we beat when he fires again?

never donks airball, only made hands or draws. he probably limps all Ax but fewer hands containing an gutterball card. given your read his most likely hand is an ace after the flop donk, so just call and try to spike and fold turn UI.

yea, just call flop with blinds behind you. you are value owning yourself as the blings with cold call with all aces plus they are likely to fold kq kj etc if you just call

Don't raise the flop either HU or multiway.

Yuck @ flop raise.
You're raising either a crazily played [45]x or an Ax. You smoke both of those hands, with the blocker pair you hold.

Just call your wa/wb spots.

I was thinking that raising is good to fold out blinds and get HU with the bad EP. I thought at least one of them would call with 6 outers of I just called

You described the villian who bet as a passive old man who only bets the nuts and occassionally a draw. The board doesnt have any draws on it.

The board has a gutterball FWIW.

we have a gutterball

Hence I said this looks like a c/d spot...and I hate calling three streets.
If I'm raising anywhere, it's the turn.

you can't protect the best hand when you're already behind

What 6-outers, you mean someone with two overcards to 55 but < A? Like QJ or something?

They will go broke quickly and die if they call with QJ here after EP donks and you call. Putting in an extra bet on your part is really unnecessary.

This