Hello and Thank You for using Just Answer. I am sorry to hear about the bullying problems but no matter how tall or short you are, you must have the courage to stand up to the 14 year old. You are the parent. Tell your stepson that you are not going to tolerate any disrespectful language or actions in the household. Your wife needs to back you up on this as well. Even if he does confront you and tower over you in hopes of frightening you with his size, lay down the rules and boundaries of the household. Enforce consequences if he continues to call you "little man". Take away his phone, limit computer, tv, and video game time, limit time with friends, etc. That kind of disrespectful language should not be tolerated. It will only get worse as he gets older. Also, if he continues to bully your son, tell your son to stand up for himself without getting physical. Nobody in your household should be afraid of this 14 year old and walk around the house on eggshells. He needs to be put in his place.
If you need further assistance, just ask.