This hand is taken from memory as I'm at work and this hand continued to bother me. Not due to this particular hand but these kinds of situations in general.

This is like the 4th hand since I sat down, no reads.

UTG: $x
MP: $x
Hero (CO): $10
BTN: $x
SB: $10
BB: $x

Pre Flop: Hero is CO with A 9
1 fold, Hero raises to $0.4, 2 fold, SB calls $0.35, 1 folds

Flop: ($0.95) 6 3 2 (2 players)
SB checks, Hero bets $0.7, SB calls $0.7

Turn: ($2.35) A (2 players)
SB checks, Hero bets $2, SB calls $2

River: ($6.35) 8 (2 players)
SB bets $6.9 all in, Hero ???

PF - Standard pre-flop raise.
FLOP - Standard Cbet.
TURN - Gin ? I bet for value.
River - Wait...wat?

I opted to fold since I'm having a hard time seeing him shoving anything worse here unless it's total air, but I didn't like it.

Without reads I fold here, just on probability. He has at worse Ax, and since there are so many low cards you only beat A4, A5 and A7, which he is unlikely to raise. Also this line is just the classic way bad players try to get value from their hands. Note the result if possible and if he turns out to bluff missed draws a lot you can make a better informed decision next time.

default play with TPMK would be to fold to a Potsized donkshove allin without a second thought.

Yea dont like these spots. Vs unknown I just dump it, this is a bluff a fair bit but not quite enough imo

And 99% of the time it is for me. That is one of the reasons I was asking. For me it's such an easy laydown that I usually don't give it much thought but at some point, when it happens so often, I have to start to wonder if I'm just being weak tight.