Your response started off right, but turned a bit condescending. Regardless of what you want to believe, it's completely logical that I would never use Thrifty again.

This is the third time I've had a problem with thrifty, but this is by far the most severe. Likewise, I've used Avis and EuropeCar at least 20 times and the experience was pleasant. I ended up booking with Avis today and called ahead in advance. They confirmed that if the car is not available that they will upgrade me for free. They were very cordial as well. Sure enough. When I walked into Avis this evening in Uruguay the car I wanted was not available.

They upgrade me for free. So, please don't lecture me on how all car rental companies are the same. They aren't.