Help!?

I am a 14 year old atheist living with my ultra-fundie family in the middle of the bible belt.Today I told my mom that I was going vegan but my step dad started making fun of me and saying that all vegans are liberal, nazi, wannabe-artistic, god-hating, Obama-loving, baby-killing homosexuals.I almost started crying because I am in fact liberal, I do like Obama, I am bisexual, I am an atheist,they equated my beliefs with nazism, and that was all because I told them I wanted to be vegan.I have heard people saying that I should wait to tell them until I am finacially indepentdant and can leave,but I don't know if I can live with my mom and step-dad constantly insulting my beliefs, even if they don't know they are.How do I tell them without them kicking me out?If they did I would have nowhere to go.Advice, Anyone?