Reminds me of trying to get my family to knock on my door. They would just burst on in no matter how many times I would flip out. Everyone got on board real quick except mom. One day, my mom walked in my aggressively testing out my moisturizer. Normally, I’d whip the covers over or whatever. This time I was like ‘nah, time to teach a lesson.’ I kept aggressively testing out my moisturizer while keeping eye contact. After she left, I zipped up, washed me hands, went out to the living room and said “Do you get it now!?” Haven’t had a problem since. She knocks, waits, cracks the door a bit if she doesn’t hear my response, THEN walks in.