Against that fish you definitely want to be 3betting pre-flop, although calling isn't terrible.

I bet bigger on the flop and against this opponent consider checking back turn, once you do bet then I think folding is absolutely fine against almost all regulars at these stakes. The frequency they're shoving semi-bluffs in this spot is very low in my experience. Occasionally you'll fold to KQ but that's about all you're beating and he'll often flat with that too.