I think that polio is a sticking point for a lot of people. Even when I say that we don't vaccinate, people often ask "But what about polio??" Some people even seem to get panicked and angry when they ask that question.
I don't think it's worth a screaming fight. Are you listening to his concerns? This is something that you both need to do together and if Polio is his dealbreaker, then that should be something to consider. From what I've read, polio is one of the longest used and least reactive vaccines.
What was his argument in the fight? It could be stories from his parents or grandparents, or the loss of an aunt or something. A lot of people were really freaked out about polio not that long ago.
Would he be willing to do one polio vaccine after 6 mo of age and no boosters? Do you have access to a good naturapathic dr. who can talk both of you through the vaccine decision?
I'm not saying that you should just give in on this when it's something that you feel so passionately about and I don't vaccinate for it, but if it's not worth screaming fights either. Have him team up with you on this, don't make him your adversary. He needs ammo too for when people question him about it.
Maybe get a good vaccine book and read certain points out loud to him while you two are hanging out. Don't be like "See, I told you, read here..." but instead, "Hey, listen to this, did you know...?"