Zombie Cliché Lookout:
At some point in our lives we’ve had to deal with an unapologetic jerkass. You know the type. They like to lord things over you when they have the chance. They like to pick arguments whenever they think they can win. And they like to sling derision instead of trying to work together toward a common goal. Movies love the jerkass. He (and it’s usually a he) is a character the audience can love to hate. And when the jerkass gets his comeuppance, no one has to feel bad.
In zombie flicks, the jerkass is dealt with in one of two ways: humiliation or being devoured by the undead. If it’s early on in the story, the jerkass will most likely be embarrassed rather than killed off, since the audience needs to hate him until the third act. After that initial embarrassment they may choose to start working with the team, or they might let that feeling of inadequacy fester until they get the chance to turn it against their perceived enemy.