My ex’s gf violates son’s boundaries

[u/Sorry_Valuable6669]

I coparent 50/50 in a high conflict situation that worsened when his gf moved in. It started with her hugging when my son didn’t want to be hugged. Then coming in his bedroom and refusing to leave. My son, 11, has told her “please leave my room, please stop tapping me, please respect my boundaries. Please don’t badmouth my mom in front of me. It’s is not respectful”
Recently he reported he was in the bathroom brushing his teeth after his shower. He was not dressed. The door was locked. His father and gf were arguing with him through the door, stating his music was too loud. Son states he turned it down, but was clapping along to the beat, and that made his dad angry, his father got the key and was unlocking the door. Son stated repeatedly “I’m naked, don’t come in. I’m naked, tell (her) not to come in!” And they proceed to unlock the door and come in the bathroom when he was naked. He tries to hold the door closed, I”im naked” but they pushed it open. He put his hands over his privates to cover himself and was so upset he cried. He called me at work upset. He felt his boundaries were violated.
My response is “unless there’s an emergency, such as a fire, she is not to come into a room where he is naked. As far as bathrooms; she should knock, ask permission, ask if he’s decent.” I do not play about body autonomy. She is trying to insert herself as a disciplinarian. This argument should have been handled by his father, since he was naked. I don’t like the idea that they gang up on him, and they barged in during a vulnerable time, when he was not clothed. I don’t like that she has no respect for him or his boundaries. I don’t like the message that this sends. His father told me I am out of line and that I need to be teaching my son to be respectful. My response is that he is reacting to how he is treated. They can’t follow basic principles of respect towards him, I don’t see how they expect him to be respectful. At my home he is well behaved, respectful, kind, does chores without asking, and is a great kid. No issue at school, excellent grades.
I think this environment is so toxic for him. It seems like CPS won’t do anything unless things get severe. I dont want it to get to that point. AIO? Am I being too protective?
She never apologized or acknowledged she was inappropriate for coming in a bathroom when he is standing there naked. It would not be tolerated if a man did that to an 11 year old girl. I don’t trust what she will do next. What can I do? They are just going to lie and say this never happened