Naw, that's just an old folk tale. If you bite somebody do you think you will be any more likely to do it again? Just continue socializing and definately try the NILIF method (nothing in life is free) which means he has to sit and stay before he gets fed, plays, goes outside, or anything else fun. He needs to know that people are dominant, but also he needs to be secure. Put him on a leash while you work with him with the door. You don't want to pick him up as a method of control, he doesn't learn anything from being picked up, that's the easy method for us people though as he can't jump up when you hold him. He obviously doesn't like being picked up either, some dogs fear being picked up and bite out of a panic reaction.