When things are upsetting, most of us can’t just take three deep breaths and be “over it”. Things don’t just go away because they hope they will, and most of the time the advice to “just let it go”, is a vast oversimplification.
Really, how do you do that?
If the event or situation was bothersome enough that someone else noticed and felt compelled to give you advice–the “let it go” mentioned above–then it’s likely not a small thing. Those people rarely have the “how” or strategy to help us get past that thing right away.
So, unless you have an idea of how to help someone get past a problem, practice empathy and try to simply recognize that they are having pain or a struggle rather than telling them to get over it.