What do you expect? You're a customer? You're an inconvenience. You get in the way of them doing their job.
Sound ironic? Isn't their job to prepare food and serve it to you?
No.
Their job is to do what they have been trained to do to get paid.
And for God's sake don't ask for something to be prepared a special way.
This McD is a franchise, not corporate, so they don't participate in all the price specials you see on tv.
So don't expect to be made to feel welcome. After all, you're a customer...which means inconvenience to them.