Is this normal in front of a 3 years old???

Hi

My husband roams around fully naked in front of our 3 year old son. I feel very shaky about this and i told him off few times and even tried to take my son out of the room but he gets mad at me and makes me feel as if its not a big deal. He says its ok he has same parts as me. Can u pls tell me how u would take this??