The pilot just managed to create a massive amount of bad publicity for Hawaiian Airlines for no reason at all.
He should at least get reprimanded. In a normal industry in the US, he would in fact get fired for that. Airline pilots are unionized so he won't get fired, and that's probably just as well for what *might* have been an honest mistake. But make no mistake, the pilot severely hurt his employer both reputationally and financially by doing something blatantly wrong. In the non-union workplace, that is typically a firing offense.
I am a democratic socialist so i always stand with the unionized workers and not the employers who exploit them for corporate gain.