Yes, I think is standard. You're just beating a random bluff.
3barrel seems fine too. You can check OTT for pot control but 3 barrel is good.

if u fold this u fold everything, this is toppest top , never fold , nothing beats u only 3c TT 3c JJ 1c 44 3c 66 and he might 3b some of those pre.. thats like 10c , and he can have gazillion of misset FDs 57s ..or just going nutz with some blocker i.e. 65 A6

Look at all this valuable information ;D
The theorist

This comes down to the question(s) if villain is capable of making moves? (Capable of turning made hands into bluffs? River agression stat?) Some players spew with missed FD's too much, and some never bluff here. I'd probably muck it readless. Without the Kd it's a bit close and GTO wise I think this is close to the top of your range and should be called.

This gu(a)y has 3bet 2%, so he is more passive than agressive. So i think vs THIS player is an fold. On nl25 people seldom bluff on river, i does enough calls in spots lile this and saw nuts.. Maybe higher limits fold would be mistake but here is it more an good fold than bad fold.

villian raises river after you triple barrel a consistent sizing from UTG,, not a standard call in any means unless you play in retardedly aggressive games. bluff raising river is few and far between, probably a solid fold

My experience with river aggression like that is mostly donk / cr from 50/5/1 and they always seem to have the nuts when they lead or cr. I am not even sure if villain has a flushdraw on the river that often, given the flop is paired and he is OP.

Hate to give up hands like that though. I feel i need to call just to punish his good run:)