The guy on the right's haircut is bad, but he denies it. Denial is one of the defense mechanisms which involves a refusal to accept reality.
DENIAL
What? No it doesn't. This is how I wanted it
DISPLACEMENT
He is mad at the random bystander rather than himself or the barber. This is a defense mechanism that redirects an impulse
Why is this dude there! My haircut is definitely his fault!
He is an adult that's crying about his haircut. This is a defense mechanism called regression where ego reverts to an earlier stage
Regression
(crying) why does my hair look so badddd
He thinks that his hair will grow back by tomorrow which shows his defense mechanism where he lies to himself to make it seem better
RATIONALIZATION
I mean, It'll grow back by tomorrow and itll look good.
He now is telling himslef that he is David Beckham, a famous soccer player that had a mohawk. This is a defense mechanism where one takes another's identity to make themselves feel better.