oh mi gosh yes, this is grounds for a complaint if you so choose to do so! I would be horrified myself! It's one thing to talk to the client about you as some random person, but to have to look face to face at this client, not knowing "just how much" he knows, is horrifying! I'm so sorry you are dealing with this issue to begin with, and then having to deal with how badly your T handled this. Especially when you said no! Even if you hadn't, she should have asked you AGAIN, prior to setting this up, rather than blindsiding you with it with no notice. You have every right to be angry with her, and however you choose to do it, she needs to know this was NOT ok! Did you stay for the whole session after this happened?