Who cares why it happened originally? It stuck and people do it now for whatever reasons they want.
Apparently you do because you had no problem defining the criteria for a deserved whooping. So which is it? Whoop anyone for whatever reason you want or only whoop guys who meet your criteria?
But I don't have the right to tell anyone who they can or can't taunt at a game for any reason. The reasons they choose may be stupid and pointless but hey, they have a right to be stupid and pointless as fans.