It sounds like he raged quit the game. Maybe he finished at 2.01% ranking on the conflicts that just ended today. That tends to drive players mad.
This situation has crossed my mind. Not that I would do it myself. But the fear that someone would do that to my squad has made me limit my squad to just two officers. If there was another way to award merit to well deserving squad members, I would welcome it. But I'm not going to give just anyone the ability to boot other players from my squad.
SC Hose - Officer, PartyLikePorkins (a Top 100 Rebel Squad)
Jr Hose - Leader, Creeper624 (a casual but active Level 46 Rebel Squad)
These are the squads you are looking for.