Which side would you be on in this argument?

There is a guest who visited my house who smokes, while he is in my house. The whole house smells like smoke. As a result, worrying about second-hand smoking, I open the front door (the guest is in front of the door) and the backyard door, attempting to get the smell out by waving my hands. My dad argues that this was a rude gesture because I was doing it in front of the guest. He suggested that I go inside my room instead. I argued that I care deeply about my brother’s health, and do not like the entire house smelling like smoke. Who’s “right?” Why?