You can always quit and go home. And if it's your ball, you can take it and fuck up the whole game.
You can nut-punch him, like Ratface Jason Terry, and try to take him out of the game.
Or you can work your ass off and try to get good enough to beat him.
But bitching and whining about his attitude won't change a damned thing that happens on the floor. How the Warriors act isn't my cup of tea - I hate those arrogant pricks, and if the Spurs beat them it will be that much sweeter. But the truth is, that attitude is part of the reason they shoot the way they do. Any shooting coach will tell you that confidence is a factor, and those fuckers are seriously confident. Every time they put one up, they expect it to go in. Danny Green could use some of that.

