You have to show a bit of grace, sure, but if the guy continues to use your rear bumper excessively, and a friendly talk after the race doesn't yield the results that you are expecting, then it's time to talk to the track owner/promoter, and flagman (without the usual whining.) If they aren't willing to take some action, then it's likely time to find a different track to race at.
Similar case for us on dirt; There was a particular racer who was fast but chose to race us like this. My attempt at a friendly talk with the father of this particular driver resulted in his puffing out his chest, spitting while cursing at me, etc. So I instructed my driver that the next time it happened to intentionally dump them. Not what we wanted to do, but no one else was willing to make a call. Trust me, it was obvious enough that it got the track's attention after that.
I liken flagmen to referees at a basketball game.
If the refs call every little tic tac foul, then you'd better be on your best behavior and race cleanly.
If the refs let the bigs inside beat and bang on each other, then you'd better be prepared to get your elbows up and race to the level of the officiating.
Again, not how we prefer to race, but if that's the way the game/race is officiated, then be prepared or take your kart/dollars/business elsewhere.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
z
www.CarlsonMotorsports.com
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33 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com