Bad attitude from workers.

I just bought a meal at Mc Donald's and the Burger bun was a bit distorted. When I went back to return it the ladies working in the kitchen started making snide comments about me returning my food in Xhosa which I am fluent in. I don't expect to pay for a meal I am not entirely happy with and I definitely do not need the drama of having to be gossiped about in my native language...its ridiculous