Seriously?
It's rare that you would see this happen, no? Half the players in the room changing ship every time? Can't help but think you're exaggerating a bit.
When a room is full, it's hard to let people change ships, because it starts on auto. Maybe he was being a dickhead - I wasn't there so don't know, but sending the guy a message and asking if he could stay in the edit game screen for a bit to allow people to change ships would surely be far more likely to get the desired result? You can't know anything about him either, whether the reason he's messing around or just generally the type of person he is. If it's that bad, start your own game maybe? You could invite the other people in the game to your game via players met, as I'm sure they'll appreciate a good hoster if they were having such trouble changing ships.
Bottom line, how can you complain about his message when you sent one along the same lines? Those kind of messages only spread bad-feeling between players IMO.