experienced traders and investors may not be affected by market conditions. but what happens to new traders and investors, creates enough psychological stress to make them panic. this is something that naturally happens to beginners. but after they know how this market works longer, of course, they will be more stable in determining the plan.
Even an experienced traders/investors will still get affected with the market condition it's all about how to control yourself in this kind of situation that's why they will be able to last long than those who haven't had any experience.