This sort of behaviour has become much more prevalent than when I was a teenager, way back in the mists of time. It happened then, too, but not to the same extent.
It has become almost acceptable now, and that is ok, things change, the present generation is different.
My concern here is that Grealish has to be more careful or he will destroy a very promising career. He has been warned already, and all it takes is for a headstrong manager like Sherwood to decide he will not be messed around with, and Grealish is out the door, and we have lost what I think will be a very good player.