I don't really hate this kinda situation because it will drag on for some chapters..
But what i hate it is..it doesn't make sense why he bothered with just an extra..the hell...
He's mad because she only paid attention to Mutou and not him. He's a classic narcissist who thinks the world revolves around him because he's a popular actor.
Seriously? You see someone without a head and get... jealous? "I'm gonna ruin this extra's career because (1) girl didn't pay attention to me. Boo hoo. I'm a sad infant man." What a jerk.