The old saying I usually quote to the folks who ask if I am a piper when they see me in my kilt is:

The definition of a true Scottish gentleman is one who knows how to play the pipes...and dosen't!

Since the only exposure that most folks get to kilts & tartan is through a piper on the tele or at some sort of service, I usually try to be tolerant of these types -- at least they know you're Scottish!

Cheers,

T.