Knowing that people will/can not alter their belief that something that they believe and/or have been doing for years/decades is incorrect and/or improper (called "cognitive dissonance") I've resisted the temptation to post again in this thread, but I just can't resist any longer.
Anyone who believes that intentionally and deliberately cleaning anything of theirs, including a dirty cue tip, by digging it into somewhere elses carpet, regardless of who does it or where it is done, is perfectly fine, not disrespectful or just plainly in poor taste, is, at best, inconsiderate, lazy, and a very poor guest/customer.
The arguments trying to justify the behavior using irrational comparison is equally inconceivable. Saying things like "we walk on the carpet with our dirty feet" or "when I chalk my cue, powder always falls on the floor" is simply someone desperately trying to justify their own unacceptable actions...walking on a carpet is the intended use of floor carpeting, not a misuse, and chalking your cue unintentionally causes some powder to float down to the carpet, an unintentional consequence, but digging one's cue into the carpet is neither it's intended use nor an accident. Huge differences.
The end of the world, no...but very telling...and the "story" isn't very complimentary.
Sorry, I'm out.