This behaviour must be repetitive or serious. What matters is not
each act on its own, but all the acts taken together. Sometimes
one act does not seem very harmful. However, all the acts taken
together might make you feel badly.

One act can also be considered psychological harassment if it is very
serious and you feel badly for a long time after;

and

Unwanted means you do not welcome the act, even if you do not say
so out loud. You can tell someone you do not like the way they are
acting with body language, for example, by the way you stand, or the
look on your face; and

The act or acts harm your dignity or psychological or physical integrity.

You feel ashamed or worthless because of the unwelcome act or acts.
Your physical health may also suffer. For example, you get headaches,
stomach-aches, or want to throw-up; and

This means you do not feel welcome in your workplace. You feel distanced
/isolated/set apart from the other workers, or you are afraid to talk to your
boss or another supervisor.

You may suffer from psychological harassment only if all four of the above
conditions exist.