Requirement to say bye??

Is it a requirement to say bye to everyone before you clock out? Are they just trying to encourage team bonding/building? My GM just yelled at me and said that the ACO made a complaint about me not saying bye to everyone before I left. I usually do but either that day I just didn’t want to interrupt the ACO talking or was really frustrated with my coworkers (I really don’t like majority of my coworkers; they stress me out more than customers).