I'll admit, at first, I thought the Driver was being mean, but now...
When the Driver's Former Client comes up to him at a Diner and begins amicably chatting with him, and then tells him hid brother died, Driver says something along the lines of, "Shut up, and leave me alone, or I will kick your teeth down your Goddamn throat." I thought the Driver was being mean. He just told him his brother died, and instead of offering him sympathy and condolences, he threatens to beat him up! I hated the Driver in that scene!
But, later on, I thought, "Would I really like a former client to come up to me in a diner and begin talking about how his brother died if things were strictly business between my former client and I and I didn't know his brother? The answer was no. There was no reason for the former client to be telling The Driver about his brother's death.
Although The Driver went too far with threatening to beat him up. The Driver could have simply said, "Your brother's death is none of my business," and left it at that.
It's so ironic that Ozzy Ozbourne, the Prince Of Darkness, is so damn adorable.