Good for you. I certainly do. The BBCs attitude to those that don't pay it is utterly abhorrent. They've got no business knocking on my door just because I might be able to watch some of their crap through my phone or PC, nor should I be under some sort of obligation to prove to them that I don't watch BBC channels. GTFO.
They didn't invent the motion picture or have exclusive rights to it, but they sure act like they do.
I agree, that attitude is disgusting I do not condone it at all. My experience has been fairly minimal, at university they came knocking I said I have no TV. They didn't even bother to check. Then more recently about 4 years ago I additionally said I didn't watch TV and have had no contact since.