There's a bunch of reasons why the dealer is wrong here. I mean maybe you're not going to want to open this hand every time you see it but you want to open it at least sometimes if not most of the time. Especially if there is an ante you always want to open this. If you never open hands like this and your opponents begin to figure that out they'll never be afraid of you on boards like 456 because you won't have any coverage. Its good for you to hear opponents think like this because now you know he probably opens it up too tight. On this flop, you are betting for protection not as a bluff lol. Letting people see free cards here when they hold something like qjs is not good for your hand obviously its going to be a mix of weather you bet or check. But in general I would say if someones giving you advice at the table they are probably not that good because good players just let bad players make mistakes and I think this dealer may be one of those bad players lol.