Ha, that definitely wasn’t me! I’m too short to be Tigger 
Anyway, I don’t know the Cast Member in question, but I can tell you that characters DO NOT under any circumstances hit a guest for no reason. Some people believe that he was trying to undo the back of his costume, and to be honest with you, when I watch the interview of the Dad and Son, it doesn’t seem truthful. They’re honestly full of it, and I think the son did something to provoke Tigger.