Therapist justified my trauma (childhood bullying and racism).

Hi all. I originally posted this on r / talktherapy and was advised to visit this subreddit. So I've been going to therapy for over a year. It was going well at first, but then I didn't notice much progress in my mental wellbeing despite going there often. So I was debating on quitting. However, my last session was the final straw. In the most recent session, my therapist pretty much justified my trauma. I won't get into too much detail, but I've been bullied growing up and experienced racism and my therapist pretty much justified it due to her own political biases against my cultural background. I absolutely plan on quitting our future sessions. I felt it was an awful thing to do (my mom and sister are both psychologists and said it was inappropriate and unprofessional). How do I quit? I want to send her an email explaining why, but how do I do it? Thanks for your help.