TB, no one's parents are identical. But in the end I think my mother and his--both want to fix everything. I couldn't have not had this be terribly stressful between my mother and I at his age either.
Understanding some of my mother's frustration helped me. And, honestly, if I'd made my proclamation and she hadn't been working with me, I'd have withdrawn and shut her out (though maybe I wouldn't let the friend beat her up--he might get hurt) and considered it exactly my right to protect myself in the situation of pain.
Standing up and saying "We both want the best for me, let's start from there" may turn out differently for you PC, but I think when you're ready to say it, do it with sincerity, conviction, empathy, and love.