It's a legitimate playground technique to get the ball from a 'wellington boot' who's obstructing it! Kick the ball out from under their weight.
In all seriousness i don't see the big fuss, the ballboy is 4 years younger than Hazard, not a kid, he's acted like a knob and then rolled round feigning injury as his first reaction was to swear at Hazard. Hazard hasn't gone into assault him a la Cantona... he;s gone to get the ball back.
He's also just gained 25k twitter followers in half an hour, an seems like he's full of complete fuckwittery.
I'd say perhaps some good has come out of this and he won't act the **** again, but looking at this, and the fact he's apparently the son of a Swansea Director,
There is a Martin Morgan on the board of directors, so could be true.