MoscowRadio
Flush
There are plenty of times I would cold call a 3-bet.
If I am the original raiser, a significant chunk of my range becomes a calling range - say I raised from the cut off with pocket sixes. Assuming the stacks are deep enough, the pocket pair becomes a set mining opportunity. A 4-bet with pocket sixes is, at best, a semi-bluff. But the hand is too good to fold.
Cold calling a 3-bet is situational when I am not the original raiser. There is always the risk of getting 4-bet - so knowing your villains is critical. Stepping into a slug-fest between two LAGs can turn you into collateral damage. On the other hand, the payoff can be sweet! There has been several memorable hands in my life where the other players "forgot" I was in the hand until the trap was sprung. Sweet, sweet victories those were.
Never say never -=- DrStrange
I very much agree with this, especially in position. IE: if I raise the cutoff or the button with a small to medium pair or strong suited connectors then they are absolutely a part of my range and I will flat-call a 3-bet from SB or BB. If I have a solid read on the opponent I'll even call with more marginal hands with position on my side.