Yes, I thought so too, so I stopped for 2 mins, noticed that the other guy also stopped. When I finally started driving again he waited until I "passed" - well I didn't, because he was aimed directly at me and launched as soon as I came around the corner... I repeated this experiment 3-5 times during the race - and every time he waited, and tried to ram me as I came around "his" corner.
I've seen bad driving in gt5 too - people bump into me, I bump into them, but waiting for two minutes in order to ram someone is not due to bad handling.
I had a similar experience in the next race, this time a different person, but the same behaviour.
But there is hope - you are secretly rewarded an "aggression vs perfection" stats that they never show you, so they will pair you with "like-minded" drivers once there are enough people online...