" You are NOT allowed to steal backpacks or structures from players on PvE Starter Playfields (planets and orbits) . This rule only applies to PvE Starter Playfields, not PvP Starter Playfields ."
Not something I myself would do. I am not disagreeing it is a dick move, but it is not against the rules. Chalk it up as a lesson learned rather than start a heated argument that will only hurt us all.