When I eat Chick-fil-A, I eat it in the worst way possible.
Is that so? In what way do you eat it?
I always cause a mess in order to make it as difficult as possible to clean up after me.
You shouldn't make a mess when you are eating, especially when someone else has to clean up after you. You are making someone else's day significantly harder and more annoying by doing that. It's extremely inconsiderate and rude.
But the employees get paid to clean up messes.
Even though they get paid to clean up, it's rude to intentionally make their job more difficult. I think you should try to be neater when you eat at Chick-fil-A, because going out of your way to leave a mess is just inconsiderate.