Happy it was on Stevenson, but definitely not a flagrant - 2. Nate pulled him down while he was still on the court and mostly by the arm, not neck
Being in the air and taking your first step are not remotely close to the same thing. And since Stephenson was taking his first step, he wasn't defenseless b/c he could've slowed down and accepted the foul. Instead, he chose to take his 2nd step and launch. This kind of foul happens all the time, but the offensive player usually slows down b/c he realizes that if he launches in that situation, he could get hurt.
So Nate gets embarrassed when he gets pick pocketed, but not when he does an unnecessary dance during a game that makes him look like a bigger idiot.
I remember the first time I saw that. Kidd has experience grabbing hair and pulling it back from all his years of wife beating.