I think you played this fine, more often than not the button has either flopped a flush or better set. If we had 99 I would like us re-raising to stack 66, but since we have bottom set and there's 3 people in the hand, I can't see button raising here with a naked draw.

Turn shove for me is an easy fold with 66, with 99 I'd be thinking about it and KK I'd almost always be calling.

Yeah if villain is a nit I think you played it fine. Even if they're not it's an ugly spot. He likely never has 2 pair here so he should have a bunch of flushes, flush draws and 99. Draws should only be of the A-high variety and might play more passively IP so I think the turn fold is good.

Like @Harvie mentioned it would be closer with the higher sets since if you have 99 he can now have 66 or if you have KK then he can have both lower sets that you're ahead of. There aren't a crazy amount of flushes so being ahead of 6 combos of sets makes a pretty big difference.

I wouldn't get into a habit of folding sets 100bb deep at NL10, but if there's a spot to do it it's certainly multiway vs. nitty player on this texture. Well played.

My usual rule is if in doubt get out, it helps keep me thinking sensibly(sometimes)- and this looks like one of those situations. I think the call on the flop is fine and that's a nice fold on the turn. Not a nice way for our lovely set to go, but a good job done.

I like it and would play the same line.

Against a nit we can't stack this on the flop but have an easy call to fill up. Once he bombs the turn it's unlikely he's doing it with a bare Ax draw so folding is easy. With 99 I probably would go with it though unless he really is a comfirmed passive nit.