Agreed. He really crossed a line on that one. Standard operating procedure should be to NEVER reveal ANY information about a customer, even whether or not they are customers.
One more reason to shy away from Joyent.
Edit - Jed from Linode?! Hey! You sir are my favourite support person to reach, yet I rarely get you anymore.
He didn't ask. My past interaction with them is irrelevant, because I only commented on their tickets enough to determine that it would take hours of my time and recurring hours of administration to take them up on their "free" offer. I decided to stay with the service I had paid for in advance.
Although relatively harmless, it seems like planting the seed to a disregard for privacy.