I told him I'm done be treated like this by my adult SS21 for the last time. This time I told him if his kid does not start to respect every one I am gone. 

My H says he is going to talk to him. I told my H that he needs to stand his ground. If his son can't handle being respectful then I'm out!  My H will find out that if it's just him and his son things will not be better for them. So my SS better learn to shut his mouth because this is my final straw.