What is wrong with levered naked shorting?

I don't understand why WSB, or anyone, has a problem with shorting. ? As a trader or investor over the short term you can have a view that the market (or a commodity, or a single stock) is overpriced and decide to go short rather than long.

WSB seems very angry at 'wall street' making money by shorting stock, even more than they are angry that assets are in a bubble.

I know talking to American trading friends there is this weird idea you should only ever go long (prices must go up!! haha) but if the purpose of the market is price discovery (and certainty in the case of hedging) and something is over priced then the price should fall and a trader should be able to take advantage of that.