Is it rude to bring up a friend's ex when meeting their new partner?

Hellisia
My boyfriend (38m) and I (37f) have a respectful and straightforward understanding that neither of us enjoys discussing or hearing about each-others' exes - both of our past relationships ended on bad terms, and neither of us has or wants contact with our respective ex-partners. The subject isn't taboo, and we're both happy to honestly answer questions the other has about our past, it's just not a subject either of us wants to talk about or hear about it. This has worked out great between us and we have minimal conflict around jealousy or the past in our relationship. However, I have noticed that oftentimes, usually when I meet female friends of his for the first time, they bring up his ex. These aren't usually people he is very close with, and it's not usually in a way that sounds particularly malicious or flattering toward her, they just bring her up, like "I've been over to your house when he and [ex's name] lived there together," or "When he was dating [ex's name] this happened," etc. Am I way off base in thinking this is pretty darn rude of them? I understand people have different boundaries around what they feel comfortable with or insecure about regarding the past, but it seems like a stretch to assume that someone you just met will be comfortable with talking about their SO's ex-partner. Signed, A Non-confrontational New-girl, Over Your Extra Drama
Is it rude to bring up a friend's ex when meeting their new partner?
35 Opinion