Situation I'm a bit unsure about

Ok here's a spot where I'm not exactly sure what's most +EV...

You are in SB. Villain is in MP (HJ in 6max I guess) and is not a maniac or a 3/3 nit. Villain raises to like 4bb's and you hold 66 and call and it's HU to the flop. You both have 100bb stacks. Assume villain cbets the majority of the time. The flop is 237 rainbow. What is your standard line here? Does this change if your hand is 88 instead of 66? I'm not sure what is best as villain will have missed a lot of the time. I guess tailor your advice to suit 25nl.

3bet pf more often than flat, but also fold. small PPs are at the bottom of the range you should be playing. at the very least c/c flop. you can stop n go or c/f turn, depends on how well you know villain.

Fold w/o more info.

If it's a maniac, we 3-bet, if it's a nit we obviously fold. Sane stats suggest sane raises. If we know the player is positionally aware then we can 3-bet, but otherwise, at 25nl anyway, I think we just get out of the way. We don't know how good we are pre, and the only flop we're happy to see is one with our set in it, and then we're not sure if we can get paid for any more than a c-bet.