Generally,I think everyone can lose money in trading,but when someone loses money on daily basis or regularly,it is either the person is a novice,or he in experienced and doest learn from the experienced people.
I've seen enough experienced trading losing their money in the market and losing many times in a row too.
sometimes the market is just so volatile you don't know what path you should be taking, there are also many pro traders doing copy trading service in many exchanges that are losing so much money within the sudden dump or sudden pump and i've witnessed it from my eyes.
it's either the narrative of the market align with your bullish or bearish idea or you won't make profit at all.
but the one that are down bad are the people who trades future and take too much of a risk trying to take shortest path to profit which is by over leveraging.