Way back in 1988 when I was in Year 7, we had a science class dissecting pregnant rats. I refused to participate and sat outside the classroom. It was this incident that was the final catalyst for turning me vegetarian.
No alternative teaching method was offered but I was never threatened with failure of the subject. I think the teacher empathised with my stance. Looking back, I think she may have even felt admiration for the courage it took to stand up for what I believed in, despite the fact it made me "different" and a target for teasing. She was also my homeroom teacher and at the end of the year she gave each student a "fun award." She gave me the Animal Liberation award, which I have kept to this day, as it meant a lot to me to be recognised as taking the issue seriously.
Other students giving me a hard time was the worst part to me. I was already not one of the popular crowd and this just made things worse, but obviously I felt very strongly about my beliefs because I never backed down.
Saddest thing is that now I'm an adult, I'm still given a hard time, usually in the form of jokes or people who think they now what's best for me in regards to nutrition. I know we all get that but all through school I had hoped that once I reached adulthood, my peers would have grown out of such pettiness....alas, not so