When you are in a graduate program, you are really expected to handle yourself professionally and are under scrutiny for all interactions. I would think this is particularly true in a therapy program.

If you really wanted feedback (which is not how you started the conversation with the professor), the proper way to go about doing that would be to 1) accept the grade wasn't going to be changed 2) make an appointment to meet with the professor one-on-one for a conference so you could both have eyes on the paper in question together.

You are still placing the blame for this on the professor when the problem here lies in your ability to accept a very acceptable grade rather than accepting that your behavior was without boundaries, quite pushy, and very disrespectful. Even the way you are handling it right now, publishing the email conversation on a public forum, is showing very poor judgement and boundaries. This IS a problem for you that has shown previously and is certainly something you need to work on remedying.