Overusing sarcasm is a method of expressing displeasure or discontent without actively pushing away those around you. You’re not actively insulting them, you’re

Overusing sarcasm is a method of expressing displeasure or discontent without actively pushing away those around you. You’re not actively insulting them, you’re “just joking,” but simultaneously expressing negative feelings. As a pointed remark, it can be hellishly funny. Used as the crux of a sense of humor, it is pretty clearly a scream for help, even if the speaker doesn’t know it yet.