While I don't usually, I'll occasionally do it after a close match that I win just on impulse. In fact there was one time where I did it to this one guy and he got so mad that he messaged and reported me! Well after the match my friend and I left the lobby and were talking about it only to be put back in the lobby he was in, but on his team. We then decided to unrelentingly tbag him for the rest of the match, and somehow we managed to win(i was at the top I think) which made it that much better.