Your irate reader seems to forget that he allows the TV signal into his home by either purchasing cable or using an antenna to capture free TV.
Furthermore, when he goes to another's home, he implicitly agrees to rules of the other homeowner and that includes the other's choice of TV programming.
Additionally, when he goes to a public (or private) business he again supplies his implicit agreement that he can not dictate to the owner except by refusing to purchase their products.
Too often people complain about being incapable of avoiding "all that filth" by changing the channel or "getting out more often." But, so what? I have yet to find any mention of a right to "freedom from being inundated with filth from the 'public airwaves'" in the Constitution. But if there were, I'd demand that the government and your irate reader keep their hands of "my" slice of the public airwaves.