I've never had a tty relay give me any static for anything. Around 2001-ish on a conference call, someone called in with one and we had him do prank calls, and he was totally cool about it. He even stayed on the call for about 15 minutes after the person using the relay disconnected.
Ever have one sing? "I'm a little tea pot short and stout, here is my handle, here is my spout...."GA
I'd think of them kind of like a shrink, they're not allowed to disclose anything unless you're threatening physical harm to someone else.