She's Way Too Young For This, Isn't She?

R has told us twice in the last week that she doesn't like boys because boys are not nice. I have no idea where this is coming from other than that she goes to preschool/day care every day and there are boys in her class. We talked about it and I told her that I like boys and that Daddy and RUS are boys, and they're very nice. At any rate, I didn't think I was going to have to deal with this for at least a few years, or ten!