Did you already pay for the class? If so, get your money back. There's no reason for being that insensitive to other people. You have a right to vent. I would make sure that I never signed up for another class with her, and I would let her know why. If you want to take a class, I would look around for another quilt shop. If there's not another one close by, there are tons of tutorials on the 'net and there's plenty of quilters who have never had a lesson and still do fabulous work.
Gas here is $4.15 as of yesterday.