You don't lose anything unless you sell

The better advice is not to hold in bitcoin what you may be forced to sell.

It's funny that because of how easy it is to sell bitcoin people often forget that it's not a security but rather a commodity. When you buy a car for $100k and next month someone offers you $80k for it, you won't sell, right? You know what you own and know that it did not lose value in such a short time.
At the same time people buy bitcoin for $120k and it hits $100k next month and they panic sell. This just proves that they did not value what they were buying and did not understand it. If you're one of such people, stay away from bitcoin.