Yes - as I said much earlier in the thread, some of this behaviour, on both sides, reflects the fact that this is the front line of a failing system.
Abuse - verbal, physical , online or in person - is no more appropriate a response than the treatment meted out to GP receptionists, again the ‘public facing’ front line of a system that cannot meet its users’ wants.
Frustration, in both teachers and parents, is understandable. Its presentation as abuse is not.