Pre flop - we raise, he calls.

Flop - KJ2 - we bet - what hand can he put us on? He has to credit us for at least the jack, probably king, yet he raises us. That's AK at the very worst, probably KJ or a set of dueces. Perhaps jacks or kings, but I'd expect him to reraise kings pre flop for sure, and probably jacks, on the button. I think we can discount K2 and J2, let's assume he's not a donk, since we have no notes. AA is an outside chance, and QQ is unlikely, based on the turn bet, but at the flop we can be forgiven for considering this hand. Of course, he could be bluffing, but again, we have no notes, we have no idea how reckless this player is. We have to credit him for a real hand, and our hand is weak compared to anything that's a genuine raise at the flop.

I must confess my surprise at how many people will call a gutshot here. At the risk of pissing a few people off, I think it's something a few people need to look seriously at. Chasing gutshot straight draws is the act of a donk, unless of course you're genuinely priced in. And crying implied odds when they don't exist is also donkish. I assume most people who contribute to this forum do so to improve their game, so it might be worth looking into things like pot odds and implied odds before making calls like this.

I don't mind the c-bet at the flop one bit, though. In fact, the c-bet should save us money, because he raises and tells us our hand is bad. If he just calls, we might be tempted to carry on firing. We asked him a question, and got a definite answer. It'd be crazy of him to be raising this flop with anything weaker than AK. So take the information he has given us, and muck your hand.