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Ok, first of all, the mistake was yours because you should've made a cheeseburger.
Her throwing it to you was out of line. You should've stepped out at that point and told your boss that you need some fresh air or you should have informed that the lady would have to pay for the burger she just messed up if she wanted a new cheeseburger.
You throwing it back at her, didnt give your manager any choice. You harmed the restaurants reputation and you had to be let go or the restaurant would incur losses because of you.