Titan does not like men at all. Know your pups body language and know when he's going to react to a man. I know when Titan is going to lunge and take necessary steps to prevent the lunge. Keep the pup on leash while introducing the pup to a man. Tell the man, "No look, no touch, no talk" and let the pup approach him while on leash. Watch the pup's body language. If the pup starts to lunge, bring the pup back to you and turn the pup around from facing the man. Tell the pup to sit and look at you. Tell the pup, "it's ok." If you are afraid or the man becomes afraid, take a deep breath before talking to the pup. With shoulders back and with confidence, tell the pup it's ok. And do the exercise again. If the pup continues to lunge, crate the pup for the pup's safety.