Congrats on the baby ... very happy for you.
I watched the episode intently this week - three times in fact - and compared it to other episodes as well, and I can honestly say that the judges were a miss on this decision. Every male contestant on the show who doesn't like someone's suggestion is shown ignoring it, shaking their head, rolling their eyes, or just informing the other writer that they didn't like it. It is on the other writer to do one of four things: defend their contribution, rework the contribution, submit another contribution, or (as Nick did) wear your feelings on your sleeve and use the rejection as an excuse to not work with someone you are jealous of because their hooks keeping getting picked and their songs keep winning. Johnny's intentional inclusion of the best of Nick's sub-par contributions showed that he at least tried to be a team player.
The judges were inconsistent this week. In previous episodes they booted people for not contributing enough (and if you watch those episodes again you will see the other songwriter doing what Johnny did) but this week they added a new rule - if you don't contribute AND you act like a big baby by pouting, throwing tantrums, and refusing to participate - you get to stay. Maybe the show should have a special elimination category next season - the songwriter who disrespects and makes fun of other contestants while they are actually performing should be called out on the spot - told they are eliminated - and then we would find out who "would have been" booted if the other person wasn't so rude.