i disagree, there's definitely room to value bet the nut flush on that board. you're getting called by a lot of hands that you're beating.

your only mistake was the turn semi-bluff IMO. laying down to the check-raise on a paired board is debatable and definitely read dependant. bad players would check-raise lower flushes, the straight, and possibly even a naked A. it's not definitely a full house.

your opponent played the hand terribly.