Being the only boy within a feminst group?

My teacher (high school) forced me to join a dance group where I am the only boy there, as some kind of lame punishment because I told something sexist (according to them) to the girls in the school. But all the girls there, including the instructor are all hardcore feminist and seems to hate boys for that reason! In the last class, being a beginnner, I stepped feet of some of the girls by accident (they all wearing shoes). And one of the girls suggested that I should be doing the dance barefoot! They all laughed and the instructor agreed to that so they made me take off my shoes and socks immediately! At the end of the class they even suggested that I must be barefoot in every class! I hated being in this situation, am I making this a big deal? And can you give me some ideas on how can I stood up against them?
Being the only boy within a feminst group?
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