I was mocked at the drive through

I put in my order and moved to the receiving window. The lady gave me half my order and asked me to park in the parking lot and they would bring me the rest of my order. I said there is no one else in the drive through so I would wait there and if anyone pulled up I'd move. Another lady then came and asked me to park in the parking lot and I said to her why can't I wait at the window since there was no one else in the drive through. She then walked away and repeated what I had said in a mocking tone. Once I was finally brought the rest of my order I told the woman that I had heard what they has said and she gave me a very insincere apology while laughing at me. How insulting. This particular branch has such bad service no wonder I was the only person in the drive through. I'm so disgusted. Surely the standards are supposed to be upheld at all branches. Can't begging to tell you how disappointed I am in the way these staff behave like they are doing me a favour.