As someone with autism, depression, and very low self esteem, I play Destiny, amongst other videogames, so that I feel like I'm accomplishing something, because I excel or am even good at nothing in real life. I loathe PvP content because I've never been an above average player in anything online against other people, so when Destiny quests force me into PvP, I already begin to feel bad. From that, Lord Shaxx's lines (which I can only assume were chosen to be inspirational to make us push harder) really do not help my self esteem or depression and feeling of failure. Yes, I am trying my hardest, I can't play any better than I'm trying to, and yet his voice is always there to remind me I'm a failure and will amount to nothing. I feel like the people of Bungie have completely overlooked the possibility of this happening.
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It's more likely that they thought it was funny to taunt the losing team. They are "those guys". Of course whenever the Bungie team plays crucible it's likely most of them are the ones being taunted.