5 reasons RT ryders don't wave at RS ryders:
5: Rhematiz,arthritis,lumbago, carpal tunnel, etc. of left arm, shoulder, wrist, etc.
4: Don't want to associate with proletarian masses.
3: " Don't provoke 'em! Could be a huligan, Martha!"
2: Busy. Adjusting audio, video, suspension, grip heat, GPS...