People love having someone to blame, especially in a situation where something has gone wrong, and they're worried about the finger being pointed at themselves. Rather than taking that risk, they're more than happy to scapegoat someone directly beneath them who is going to find it challenging to stand up for themselves against them. As the saying goes… “Sludge” only flows in one direction—and that's downhill.

Hopefully, this sergeant will thaw out his attitude before the next time he asks for a favor from someone he has been treating like absolute garbage. It's really not that hard to be nice to someone—or at least decent—and deciding to hate them for a petty tribalist reason, like being a fan of a rival sports team or a member of another branch of the military, is downright insane. It's the kind of thing that works ok as a low-budget melodrama TV show plot or between two kids on the playground—but…

What a wholesome little tale.

Could be aliens, man.

Nice.