Husband thinks I'm making son "gay"?

I think its fine. My brother used to play dress up with my sister and I. My nephew enjoys wearing my heels and having tea parties. Sometime boys like girly things, no big deal. Plus, who cares if he does turn out to be a gay man? There's nothing wrong with that. People are born gay so there's nothing you can do about it if he his. Just love your son and let him be whatever he wants, for the time being at least your daughter has someone to play Barbies with.