Diddy, I don't think anyone really objects to sensible, properly applied H&S rules but it has become an industry in it's own right. Populated usually, by people who have never done any construction work but who get the right to dictate working practices to people who have often got decades of experience.
I've been on many sites where the wearing of a hi viz vest has been mandatory, it is on most now as I understand things, but what is the point of wearing one indoors?
Similarly with hard hats, what is the point of wearing one indoors? If the building collapses then those few millimetres of plastic balanced on your head is not going to save your life.