Why does my hubby act this way towards our son?!?

I think you need to just speak to him about this directly. Mince no words. Tell him his behavior is not right and that it upsets you. He needs to realize that he can't fault your innocent son for not having been a girl! Poor child has done no wrong. You must take your baby's side on this. If need be, encourage your husband to seek a councilor's help. Best of luck.