In a postmodern era, spelling has been reduced to a personal choice, and correcting spelling might be seen as an attempt on the part of imperialist authoritarians to lower students' self-esteem. Get a clue here, people. Spelling is not an arbitrary outlet for creative expression. Unlike deciding what to wear, it's not up to you and your roommate. It's an agreed-upon convention that allows all those using a given linguistic reservoir to understand each other.
Spelling correctly is important because it clarifies expression.
Reward them for catching misspelled words before they go before the public. Take pride in your menu. Consistency in spelling allows people to communicate. And that certainly includes people in the food business. Much less a Caesar salad.