Half patty, staff laughed at complaint

This morning the online order app was offline, and I unfortunately missed getting an opportunity to order breakfast but Im used to that already - that is not my complaint. I then decided to take a walk to McDonalds KuilsRiver, got there ordered my meal, came to my office and my top patty on the big Mc Meal was half (I do have a pic)look like it was broken or bit on. I took it back, branch manager is off today, Asanda helped me nicely, but the staff in the kitchen burst out laughing as she replaced my meal (the kitchen is visible to the customers. So i wanted to know if Im a joke or what exactly the joke was. You do not serve food to anyone that looks like that, I paid for it for crying out loud, but the fact that the staff laughed in my face was really disappointing.