"This stuffiness sounds like an old headmaster I once had."
Perhaps not stuffiness, but plain commonsense. Revelling in announcing (as some have)how you think that an ear-splitting sound played down a phone line is a mature way of dealing with cold callers is surely just macho posturing? It isn't going to stop people calling you, and could result in damaging the hearing of someone who is simply doing the job they are paid to do.
I find it all a little sad quite frankly that some people think it acceptable or desirable behaviour to take revenge in this way. Calling me stuffy, and accusing me - as someone else has - of getting on my high horse just serves to underline the difference in our attitudes, I suppose.