> Assault is generally defined as an intentional act that puts another person in reasonable apprehension of imminent harmful or offensive contact. No physical injury is required, but the actor must have intended to cause a harmful or offensive contact with the victim and the victim must have thereby been put in immediate apprehension of such a contact.
Calmly ignoring the threat is evidence that the person was not "in immediate apprehension of such a contact".
I only bring this up because i think it's interesting, and the underlying point you are making is 100% correct. This kind of thing is not normal nor innocent and not to be tolerated.