We boarded our YVR-YYC flight, sat in row 13, and departure was delayed by around 15 minutes.

A SE100k boards very late - well after the previous passenger did (they had current SE cards on both carry-on bags) and worked their way past the preferred seats in economy to somewhere in the back. In the process, the SE100k hits every "D" aisle seat pax with their bag in the arm, shoulder, or face.

Lots of glares and gasps. But being polite/apologetic Canadians, no one confronted said SE100k.

The SE100k looked visibly annoyed. My guess is that they had lost their J or preferred seat via a tight or missed connection (hence the late boarding), and were upset about sitting in economy minus. So why not just hit all the plebs and kettles in the plane with your bag?