I mean, I can see why he was mad. Jeremih has enough mainstream hits for him to co-headline a tour with PND of all people (who, lbr, aside from Drake collabs, only has one real major mainstream hit for himself with maybe one or two other minor ripples), and cutting his music mid-performance is rude as hell.
But still, Jeremih seems insufferable in his own rite.

He's not big enough to have a diva mentality.