Well this thread has gained some traction, hasn't it?
WookieeCookie put out a series of great responses on a similar issue. You can follow his posts here: http://na.leagueoflegends.com/board/...39662#31839662
The gist of it is that while emotes in their own right are fine, and in a lot of cases, you can even hit them multiple times, the case you have listed above isn't about that. The case above is someone who was asked to stop but continued anyway specifically to grief the other players in the game.
I never recommended that.