I was on this server yesterday, and i cant comment on yourself exactly but there was countless times when i was lapping a backmarker who was under the blue flag and i actually got rammed into the barrier. It was the same situation under non blue flag conditions where drivers were actually driving into me to stop me passing them, but to do it when you're blue flagged is more frustrating. Sure there have been times where when blue flagged myself i might wait until its a good spot to slow and let the driver pass and maybe they think ive taken too long, but crashing into someone, ramming them into the barrier hittings the brakes to a stop from high speed directly in front of you is just not good driving. Perhaps incidents such as these are the cause for your kick from the server as there were so many incidents people were getting frustrated at not being able to race.
ps. i am not a fast driver, i just try to drive safe and fairly.