Total opinion piece:
I think there may be a couple (or more) categories of shorts that get blended.
Selling long or short would have been financially advantages when TSLA hit $380. That is not debatable (in hindsight).
The animosity occurs depending on what people do after it goes back down to $250. If you are long, that looks a great place to buy in, if you are short and cover, that is also a wise move (just swapping buy and sell to sell and buy).
However, if a short trader holds their position at $250, or sells at $250 (or sold short way below $250), then starts manipulating the narrative to justify their position, that is not good information sharing (or a logical approach, modify the hypothesis, not that data)
Pushing back on over-exuberance is a good thing and can be helpful, but warping data to support a dive to zero is not. Example regarding cash 'burn': Cash balance is important for paying the bills, but investing in a new manufacturing line is not the same as dropping that money on a company wide trip to Hawaii.