He has not been well liked in coaching circles for a long time because of the way he comes off as fake and acts holier than thou and at the same time him and Tang were known as really dirty recruiters. Really negative recruiting against schools in the conference. I remember reading a story where Barnes called him up becuase of stuff he was saying about Barnes and Texas in order to call him out on stuff. He has worked hard though to suck up to people to try and change that perception.
Drew is a good coach though, there is no doubt about that and he only got better with time.
He also got cornered in a bathroom at Big XII media days by Knight for a flier he sent out to recruits trash talking Knight and I want to say Gillispie (?) which is fine because both are worthy of it but that's not the only times he's gotten sideways with other coaches about his tactics.