Dude at least 80% of the emotes are designed to piss off whoever you're emoting at. Arguably all of them are. This tells me Bungie is well aware of the process of taunting in the crucible. Putting arbitrary moral values on these things is silly IMO. Teabag, Hotline Bling, Charmed, Sumo, Slow Clap, dance, wave, sit down...all serve the same purpose in the end