Everytime we cannot expect the prediction of the market to move as we wanted. It is free to move anywhere, also there are more factors that make a difference in the market. Importantly whales often try to manipulate and tries to take profit out of the same. By those situations we need to be ready to accept it, and quitting for these reasons will never let you earn through trading.
I bet you didnt clearly read what you have qouted . the guys are talking about gambling but your comment is too far from their discussion . whats the connection of the market , manipupation , whales , trading into gambling ?
Now on topic : quiting after a lose is okay only if you feel bad luck or if you dont have an extra cash to spend with but if you still have some spare cash to use then go continue playing . stopping after a several wins is also a good idea to sucesfully profit on gambling .