I actually saw a little of what the original poster was saying. I think some of it had to do with him struggling early on and honestly think a little of it is him not being "the guy".
I immediately said to my 12 year old son after a couple of his mistakes that I thought his body language was bad and about 20 seconds later K pulled him. In all honesty, RJ's play in the Army game reminded me a little of Tatum and his early season struggles before he figured it out and was unreal.
So perhaps a more accurate and constructive way to discuss this is to frame it as RJ is a young teenager who makes mistakes and is adjusting to playing college ball. Bobby Hurley and Quinn Cook both had times in their career when their body language was poor and both got the "sit down and watch tape of your poor body language" treatment from the coaches.
Saying that they have a poor attitude is more like an attack on their character and suggesting that they are a locker room cancer which couldn't be further from the truth with RJ. If the OP is actually a Duke fan he probably should have approached this topic very differently, and probably should not have made the thread title what he made it.