$50 NLHE 6-max: $ : Folding KK in a 3bet pot against an utter donk??

$50 NL HE 6-max: $ : Folding KK in a 3bet pot against an utter donk??

Opponent is 63/47/43 (75 hands)

Its a 3bet pot, the guys an overaggressive fishcake, yet the board is disgusting and hits his connected anything range hard.
Is a fold a possibility here?

Full Tilt, $0.25/$0.50 NL Hold'em Cash Game, 5 Players
Hand History Converter by Stoxpoker

MP: $125.45 (250.9 bb)
CO: $56.95 (113.9 bb)
BTN: $52.40 (104.8 bb)
SB: $79.25 (158.5 bb)
Hero (BB): $50 (100 bb)

Pre-Flop: Hero is BB with K♥ K♠
MP raises to $1.50, 3 folds, Hero raises to $4.75, MP calls $3.25

Flop: ($9.75) 7♦ 9♦ 8♣ (2 players)
Hero bets $7, MP raises to $30.75,
Hero ??

Against a villain that crazy?

I probably just shove it, expecting to get called by pairs lower than ours, flush draws, straight draws and naked overcards more than enough times to outweight the times when we get called and we're behind.

Ship it, with a small fist pump.

Whatever you do, don't fold.

Yer I spose it isnt really that debatable.
You just start second guessing yourself when they keep insisting on showing up with JT here

Also, 3-bet bigger. I make it $5.50 minimum here. Probably like $6.50 vs. this moron.

It also isn't like really loose players have a calling range of like 67s+, pps, broadways, etc. it is like xx, oh look i hit a pair, raise. Obv a real bad board, just coz so many legit hands have excellent equity/have you crushed, but a bad player has way more non-legit hands than legit hands in their range and you shouldn't even consider folding.