Well first of all how do you know they don't act that way with all bikers, regardless of sex or race? Are you saying you've never been challenged by any black dudes? Maybe its not a race issue more demographics. Diesel trucks = people that are ignorant about sport bikes and only know Harley's ( not everyone so don't go off on me if you have a deisel truck). Diesel Trucks can beat Harley's. Thus they think they can beat you. LOL Do they actually take off and try to leave you or just rev the engine? maybe they just want to see the rearview... Maybe you should post pics ...