However there is something to be said for dressing and behaving in a manner appropriate for your job. If a coach has certain minor quirks (clapping, incessantly chewing gum) then it doesn't matters. But McDaniels' acting and talking style resembles a stoned college guy on a Saturday afternoon . Which I argue is not appropriate.
To use a rather extreme example, I work in a professional engineering environment and often have to face customers. I cannot show up for work in shorts, cut sleeved t shirts with tattoo showing while expecting my boss to say "I am fine with his dressing as long as he is selling".