And, even if he were, it would be perfectly safe to borrow his tools, walk his dog and even kiss
him on the mouth, were you so inclined. You might even hug him, too, because he probably needs it being around people who think he is one day going to sneeze on them and give them HIV. Might tend to make one a little weary after a while.
So, now you know and can allay your friends concerns. The name of the game here is education, though.