If this is your only complaint, get over it. Yes, they had a bad attitude, so you had a issue with it, and come here and whine. Get a life. Get out in the world and see what really makes life hard, but moaning about the service for BMW parts purchase, is rather short sighted. You should of called the next business day and spoke to the GM/Owner and told then how you feel, end of story.
You are entitled, to nothing. Thats life.