White does have a Stephen Jackson-esque at ude. That was apparent last year. In summer league, it's more of the same.
He pouts, he hangs his head, he stares at people after he dunks and all that stuff. However, I don't think it's a huge turn off to the Spurs because White has been this way since high school. If they wanted a robot, they wouldn't have gone after White.
That said, his offense has been pretty poor so far in summer league. His defense has been good but he's not putting Bowen like effort into it. Those two things concern me more than his at ude -- which was expected.