When a ship is full of passenger and someone wishes to enter that ship, the option to kick a passenger is given to them. The Game will randomly select the person to kick and it can sometimes kick a Player instead of a NPC. This is perfectly legal and is a FEATURE!
Some Players have used this to their advantage and will have a PC board a players ship and use the Kick feature repeatedly until the Player is Kicked. This is not a feature and should not be done. Kicking a Passenger to board a ship is completely fine. Having your NPCs board a ship in order to kick a Player is not. Thank You.