A fan favorite on the New York circuit where he rode for many years, Chavez is affectionately referred to by the fans as "Chop Chop" due to his distinctive riding style. His riding style, specifically how he uses the "whip, appears to be somewhat aggressive. However, this is more a byproduct of Chavez having short arms, due to his height [reportedly 4' 10], as opposed to him being overly aggressive."
The passage describes Chavez's nickname "Chop Chop" and his unique riding style, emphasizing that it's more a consequence of his shorter arms due to his height than an indication of aggression.