What do the words 'Don't Dish it Out if You can't Take It' mean?

Answer 1

it means if you can't take something that someone does to you then don't do it to anyone else

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Similarly, "People who live in glass houses shouldn't throw stones."

It's original literal meaning is from cooking, e.g. don't dish out food to others that you are not willing to eat yourself. A practical application would be if are in a position where you are leading, creating a work environment, or simply upset and want to express yourself, don't expect others to accept words, methods, and/or responsibilities that you are not willing to accept.