WHY do people ociate S.Q.U.I.D riders with sports bikes?

Nice acronym but unfortunately a false one. File it under urban legend or some what. The term SQUID was originally coined in California to refer to canyon racers on their sport bikes. It simply meant 'squirrely kid'. It was later that folks, thinking they were clever, added a word for each letter of the term. Whatever, it has come to mean certain reckless attitude toward a sport which can be unforgiving of ANY carelessness or inattention.