I would keep in mind that it is a school situation. It was a debate that I assume was for a class activity? If it had been a court trial, then I would feel differently... but because the outcome of the debate really has no effect on anyone besides the emotions of the people in the class... u know? However, I do think that your feelings had been invalidated, and that is not ok. Just know in your heart that you feel this way, and if you want to be an avid supporter of this cause in your future, then that is fantastic. But as for now, I think it would be best to try and not let it affect you too much. But its hard when ppl disagree with you about topics that mean a lot to you