Classic Yorkshire rivalry at it's best and worst. The fan who shoved Kirkland is an absolute idiot, obviously, but I see no reason why one should slag off the entire club, although the saying "Dirty Leeds" have been around since the 70s. Sheffield Wednesday fans singing about the two Leeds supporters who got stabbed to death in Istanbul in the 90s was over the line, imo, because such songs entail the meaning of "it could've been one of you, we'd still be singing and cheering about it". That's bound to stir up some feelings of anger. It's like singing Heysel-songs towards Juve fans or Airplane-songs towards fans of Manchester United. However, I'm not condoning the actions of that stupid Leeds fan, who should be banned from attending games.