You're certainly free to do so, but at that point you're really arguing about what should and should not be covered. Wear items like brake discs and windshield wipers generally aren't.
That said, ruined in 2000km is ridiculous, certainly a manufacturing defect.
That's laughable. I have to replace rotors on a semi-regular basis. It's absolutely normal if you drive your car hard even on the street.
He turned out to be right: I only recently replaced the rotors at 150,000 miles whereas at 100,000 miles, my Saturn and Ford had already had at least one rotor replacement. Since a lot of people will get a new car before the old one hits 100k, they may think of rotors as something that never needs replacing.
OTOH: those Nissan rotors were an absolute bitch to get off by that point. I was wearing hearing protection while wailing away at them with a 5lb hammer for at least 10 minutes each before they came loose.
Warping is generally caused not by the rotor warping/bending so much as uneven wear or brake material deposits. This most frequently happens because the system is driven beyond design limits and overheated to the point that the pad material bonds with the rotor. It is also possible that this is a factory related issue and not overheating, but presumably this would have been noted on the test drive, and not after 2,000 km of gas.
If I'm the dealer, I ask myself which is more likely: 1. that my delivery inspection mechanic and the customer failed to notice a braking system issue at the time of sale, or 2. that a customer with a new car took it out and pushed it to the limits?