This whole thing sounds a bit stupid to me. What's the point of saying i am the best racer at videogames. The real deal is doing it for real.
Besides, GT3-ASpec is the closest thing you will get to real life, but that doesnt mean it is the real deal.
Maybe if he came to you with intentions of saying; I want to challenge you on GT3, to see who is the best; but from saying I am the best racer from just a videogame is stupid.
Do you know what I mean?
EDIT: I tell you this, because I have already done 100% on this game, done the Indy races, stuff that takes years to practice if it were for real.
Besides, I know a good deal about GT3, done some races inside a real car, but I still dont have a license. (I did in my country but not here in the US)