What would you do if someone said this?

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I was talking to an acquaintance the other day, and for some reason the topic of homosexuality came up. The guy was telling me that he'd heard that at his children's school, they taught acceptance of homosexuality, and read books to the kids with titles like, "Sally Has Two Mommies" or something. Then he said, "If they're going to teach my kids that, they should be required to let me know about it ahead of time, so as soon as my kids get home I can tell them, No, we do NOT accept that." I was like, "Uhhhh..... hmm." I wasn't quite sure what to say! The person is an acquaintance but I'm in a position where I cannot be pissing this particular person off. What would you say to something like that? I sort of just backed out of the conversation, but what would be a good thing to say next time that wouldn't necessarily anger the person but might educate them?