You have to decide how much is too much and what you are going to do about it. You already knew what this woman was like based on how she talked about other people.
If that was the last straw for you, so be it. You probably don't need to tell her. You can just stop inviting her to spend time with you.
If she doesn't understand that insulting your son was taking her comments too far, chances are, she won't have a sense of why you would cut her off.
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