If this is how he reacts to his son not immediately bowing down and worshipping his massive identity change, then his son is better off never letting him have a relationship between the two again.

Even if he goes detrans, the son shouldn't forgive that easily. Especially doing it while he is 14, where its a guarantee that every kid he socializes with would bully him to death if they found out. Its putting your personal happiness above your kids wellbeing and dignity, which is unforgivable.