So this is how I deal with them from now on :)
Use humour! It works! After I sent this message to the player they stopped. It made my day.
[spoiler]If you just want to be a jerk and tell me to grow up purely because I disagree with the offensive nature and appalling meaning of teabagging then just remain silent. I think it's wrong and you need to respect my perspective.[/spoiler]
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#tbaggingisgreat It's a video game. A group of pixels is going up and down on your screen. What's the big deal? Why do people take this stuff so seriously? From my perspective, when someone tbags me, it makes the game more fun. Destiny's PvP is boring to me. So it's great when I can find other people that can goof around and not get butthurt by an animation in a virtual reality. It's just a game.