The word 'Tantrum' invokes in my mind a picture of either a child or someone with an overwhelmingly high perception of their status responding to things not going their way by acting out emotionally in violation of usual norms of behavior that apply to everyone else.

I would have phrased it as "Eliezer should put more effort into not occasionally being an arrogant dick."

I did not want to make that point. Acting out when things don't go his way is a distinctly different behavior pattern with different connotations with respect to arrogance. I'm going to stick with tantrum because it just seems to be exactly what I'm trying to convey.