Analyse how the character´s attitude towards identity is presented in the novel

The novel is written from Manny´s view. Manny describes his father in a very bad way.Manny calls him “old man”.I think that Manny does not like his father,because of his explanations.The father is an alcoholic and is always shouting at everyone.I think that Manny´s father is the same like Manny explains.I does not think that Manny´s father could be the opposite of Manny´s explanation.Why should Manny do so?