Most "traderz" get started when a bull market is in full swing. Their "skillz" rapidly become over-rated in their own minds, so they are completely unprepared for a bear market.
Their "skillz" include buying on dips and catching falling knifes.
After all, these "skillz" worked in the bull market.
Their "skillz" do not include playing the short side of the market.
But what about those that get started during a bear market? In my view, one of the very best things about a bear market is that incorrect trading behaviour very rapidly leads to negative consequences. This is not always the case in a bull market.