Haha I'm not going to encourage tea bagging but I will say that it could be a good strategy to get someone to lose focus and go on "tilt". Once that happens they are less useful for their team because they are so focused on getting revenge on you that they're likely to stop playing their game style and make mistakes. There's plenty of evidence supporting body language and taunting in professional sports as ways to influence the mental game of your opponents. That's why I love the new emotes, as comical as some of them might be.