That’s really awful that you had to experience that. You found a very valid solution to a disability that enabled you to learn and got shit for it. Shorthand is a real skill and professional shorthand is not easy to learn. I remember my mom had a professional secretary’s shorthand textbook that I used to love growing up. It was like learning another language and I did end up using some of it in school for my personal notes. Hell stenography is still a valid profession and uses it’s own form of shorthand. You are awesome and your teacher was an ass.