a friend of mine once told me that everyone in Phoenix is an asshole. I laughed and pointed out that there was no way she had met even a significant fraction of people, that human relationships are built with all sorts of biases, and there was no way she could make that assessment without generalizing to the point of uselessness.

she called me an asshole in reply.

you have pretty much the same problem here. you have no reasonable basis upon which to make that statement. it is offensive and generalized to the point of uselessness.