Why don't people knock?

Okay so, this morning I was having a really nice morning with my boyfriend and his best friend just walks into his room like its nothing, and she sits down and starts talking to us for like half an hour and he instantly moves his attention to her and what she's saying. I have a problem with people not knocking, because I could be getting dressed or something. He doesn't seem to, especially when it comes to her. So I don't know what to do about it. I feel like if I tell him, he's just gonna say its okay because its her. How do I deal with this?
Talk to him
Leave it and don't complicate it
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Why don't people knock?
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