Don’t like the fold at all. Don’t think that he ever has 2 pairs, since he calls in the small blind, so he should never have any combo like j8. Therefore, he either has a jack with a good kicker, draw or a set.
By folding here, you are only really continuing with 2 pairs or better, which is exploitable in the long run.
I would call, with intension of calling him down, assuming all the draws brick and jack remains top pair.

would u just call when he donks?

I don't hate your line. I can see why you raise the flop, we probably have the best hand, we can get value from draws, future streets are going to be tricky multiway. When he 3 bets it's tricky because of how deep you were, so I see why you fold, but I think with the board so draw heavy, and his value hands may even just be 88 & 33, that we need to continue IP and reevaluate the turn (basically not planning on folding unless the board texture worsens.)

Agree with emil wehner here. Further i would say that he does not reall have a lot of 33 here OOP from the SB according to preflop also he would probably 3 bet JJ sometimes. He should never hold two. So he can have sets here but not very often.

You should almost never fold when you raise for value.

People are thinking too much about how they play from the SB, not how a typical 5NL player plays it. This is why any info on villain is so important. Also the fact SB lead on a board where we have a range advantage, clearly SB is not the greatest of players (I find leads on these boards are typically quite strong MW and villains are rarely bluffing enough.

Id give villain all sets (JJ at a far lesser frequency) and AJ-J8s (probs only two combos) they can call pre where they may lead here. I'd rather flat without BB calling, but with BB calling we really want to fold out any equity here since we are MW. Issue is we can't bet/fold here with such a strong hand here so Im leaning towards calling. I would play it the same as you IG and think some may be getting results orientated in the fact that you got 3B here.

I would call vs fish and fold vs reg. Reg only had combo draws and sets here and we are crushed IMO. I like the raise in principle but I think I needs to be smaller if we are doing it with such a weak holding multiway.