I'm pretty sure if toant103 had been a good customer of that dealership, had been taking his car there for regular maintenance, their 100k rule would have been waived. Maybe if he had bought the car there, it would have been different.
If you go to a dealer for the first time at 100,000 miles, then want some difficult technical work done, you may run into this type of situation. Your best bet is to get a good relationship with a repair place or a dealer you trust....then they may treat you better when something happens at high mileage.
FWIW...If your warrenty has expired, no dealer HAS to work on your car. If you can claim some sort of racial discrimination, well.......