I don't have any way of knowing if someone else's therapist will be mad about anything or not. I do, however, think a therapist should be able to handle such things and if one of got mad over an email or any criticism - they have a problem that has nothing to do with the client.

It doesn't matter what the therapist feels - a client cannot make a therapist feel anything. They should also be very used to clients being unable to say something in the exact moment.

If it was me, I would go in with the attitude that I did nothing wrong - because I don't think it is wrong. I would not go in like I had done something wrong and was expecting punishment. Therapists do not get to punish clients.