i've run across the same thing, too.
i've blown the horn, given thumbs up, flashed lights, pulled up next to 'em etc. only two of numerous seen have reciprocated (sp?). the way i see it - if they belonged to this family, they'd say "hi". i'd hate to think of anyone actually being arrogant, especially to a fellow vx'er - but, i guess that's possible!
-jose
