if you see some of the training videos i think youll see many of pros just folding 66 in this spot as the hand will play awkwardly postflop, there are going to be few good flops and i guess you will be folding best hand sometimes on flop but it is utg raise and as it  goes youve ended up losing a significant chunk here. i suppose you have to think sometimes if hes betting into two players on turn he will have it a lot of time as we see he checked top top on flop to get two streets of value later and it worked well, i think as played out im folding turn to his delayed c bet even though he opened utg he may be going for pot control with weak suited ace or a9 a10 type hand or may even have a kk/qq.

personally i have put myself in many bad  spots flatting an utg raise with medium pairs when not real deep stacked because you often have tough decisions down the line, so maybe fold pre is better.

obv if you flat and its a62 u prob double but how often are you gonna hit dream flop, and how often will you waste chips in this pot? the problem also i think with set mining when your not deep is that even if you flop set your not always gonna double up anyway i mean if its a 622 flop and he has ak hes prob not gonna barrell off all his chips and he may even check fold on like 654 or something like that so you just win small pot. Ive seen moorman at final tables of bigger tournaments sometimes 3 bet shoving or 3 bet calling off with 66,77,55 with like 25 bbs stacks and in way iot makes sense because if he does hit hes guarenteed to win large pot and theres nothin sweeter than getting it in with 55 vs ak and seeing 529 flop lol.