Not the legal one, besides it's not the same in each jurisdiction/country.
According to Wikipedia: "Harassment can include "sexual harassment" or unwelcome sexual advances, requests for sexual favors, and other verbal or physical harassment of a sexual nature." and "It includes a range of actions from mild transgressions to sexual abuse or sexual assault."
I referred to a "stressful situation" in justifying the PT(S)D claim, i.e. to say that this was indeed stressful (as I explicitly say), whereas you seem to be in the impression that I said it to downplay the incident.