Everyone swears. I don't have a problem with it per se. The only thing is that Murray really needs to do something about his body language. As much as I like Mandy, it's just painful to watch him especially when he is losing points. I think it's hurting his focus and ultimately his game.
Fed used to have tantrums when he was young. Nole was bad too. Somehow they managed to change, calm down, stay focused and become cold blooded killers on the court. One point at a time, win or lose, you stay calm.
Muz needs to get more composed. His top competitors can read him like an open book and I'm not sure that's a good thing. That's something Lendl could teach him btw.