I left my food all over the table in the store and they threw it away.
Why did you leave your food unattended?
Because I didn't feel like cleaning up.
Leaving your food a mess on a table in a store is just like littering and is incorrect. Clean up after yourself even when you don't feel like it.
It was just a bite of food, I'm trying to live my life.
They had the right to throw your food away. You just said it yourself, you were done eating.