Used to be the case in 2017, but no longer true. You're more than welcome to get burned if you short into a hyped bull market.

It's one thing to piss on btc on hacker news but would you really put up money shorting it? There are multiple ways to do so.

You can short crypto at many places, with 100x leverage. See Poloniex, Binance, Bitmex, etc.