I'll say it again, but Bill is nototriously hard on his QBs. No one has any idea what he is saying to Drew behind closed doors. But it doesn't do any good to do it in front of millions of people on television. It can only cause a problem.
If I have my 14 year old son living in my house, and he does something stupid, I would probably treat him quite a bit different than I would my 25 year old son who is a professional and very visible in the community. It doesn't mean that i don't advise both of them. It doesn't mean that i don't try to help both stay on the right track, but there is a right way to do it and a wrong way.