It's amazing how different a training environment is when you see it up close, as opposed to how it's presented in the media. Not all players like each and every member of a squad of 30 players across all clubs in the competition. They respect each other enough to be teammates but they don't all get along. It's a cut throat environment.
Some guys (like Joel Thompson and AFB for example) are hard bastards at training and they tear in and are quite aggressive but always fair. They just train like they play. I'm not insinuating anything about these two players, I am just painting a picture that it's a tough and uncompromising environment where personalities can clash because of the nature of what is taking place...it makes sense because you have testosterone driven men who are playing for big bucks, thousands of fans want success and there is a lot at stake.
In this tough and uncompromising environment, it takes certain personalities to navigate it successfully. You have relationships with coaching staff and teammates and they are so much more complex and difficult than they appear on the surface. Just like you and I go to work and struggle to comprehend the attitude, behaviour, values, beliefs, morals and whatever else you want to throw into the pot, of other staff members, the same thing happens behind closed doors at sporting clubs.
Because we don't see any of it, we imagine a completely different world that involves handshakes, pleasantries and coffee meets. Sometimes there is a tight group who get along most of the time, but there will always be the odd outsider here and there. It's part of human existence.