I think he is struggling with some serious anxiety issues due to which he finds it difficult to argue back and whenever he is confronted or he thinks the topic will lead to a verbal dual, he rushes to the gate to escape.
Most of the time he busts out in agression and then starts bawling his eyes out. This is the sign of severe anxiety and depression. He has probably faced a lot in his life and is already mentally exhausted due to too much stress and consequently is incapable of going through the usual stress of living in an aggressive place such as BB house.