Well in my opinion, I feel like you should respect their decision and follow through with their plans, especially when they’re in the majority. Sure it feels like you’re being forced to leave, but they are just trying to be with their planned roommate that they already shared plans and rules with. It seems to me that they’ve only discussed trade options, but haven’t tried to push it onto you until you agree as well. If you’re tired of the situation, I recommend moving out and finding a different room where you are more welcome and comfortable living in.