It's a natural consequence of allowing footballers to get away scott free with the most appalling dissent every week. Of course Sterling should have walked for that, but he knew full well that most refs haven't got the balls to do the right thing. Maybe because of this ludicrous set-up whereby they are assessed by the EPL managers, which continues to be a blight on our game. No wonder so many people are drifting out of the game at kids' level, when even at professional level refs allow themselves to be treated like vermin, with the obvious consequences elsewhere.Honestly it really wasn't that gentle either. It would be one thing (I guess) if he just put his hand on him while they were talking or something, but it was pretty aggressive even if it wasn't exactly like he punched him or anything. Like I said at the time, should really be a straight red every time. Touching the referee should be completely out of line, the way it is in basically every other sport in the world.
I've seen people supporting the decision on the grounds that Sterling is young, which is just silly. You wouldn't give him a pass for lashing out at another player in frustration, so he shouldn't get one here either.
Nor does it prove that he's a bad referee. What it does show is that since 2010, he has become a lot more wary of influencing a game.