Am I wrong for this?

My boyfriend of 7 years (he’s 22) always rants to me about his mom. Today he sent me long paragraphs about how his mom walks in his room without knocking and he was naked. He’s talked to her about doing this multiple times but she still does it anyway. I texted back that I can see why he’d be frustrated and that it’s disrespectful to him to walk in like that. Am I wrong for talking bad about his mom? I feel bad because I like her but I want to validate him.

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