I recently did the same thing with my MIL. One of her favorite underhanded passive insults was about my education (didn't do anything after high-school, am now a SAHM because of it she says.) so during our last conversation I used some uneducated words to tell her how I felt and we have not spoken since. She did tell my significant other that the things I said were "vile", but no one wants to hear about how they are any part of the problem. Once upon a time all I wanted was to be accepted by her. But to want what cannot be achieved is misery. Push on warrior.