I wave at other sport bikes that have full leathers and helmets with graphics, that appear to take motorcycling as serious as I do,,or Nekkid sportbikes, or Suzuki Bandits [but not silver ones] I don't wave at ski jackets and jeans wearers 'cause they're obviously nobs,, I don't wave at Harley riders because they make the mistake of looking down their noses at my beloved Suzuki, so they must be gay, and 1% highwaymans frankly, make me feel weak and pathetic so I flip them off instead.