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"Men don't say 'breast'"
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Cis guy here. I would agree with her and interpret it as friendly advice to help you pass as one of the guys. About the only context in which I can imagine calling a guy's chest a "breast" would be, IDK, if I were doing some melodramatic Shakespearian/ren faire "ye olde" speak, or something silly like that.
'Course, I wasn't there, so maybe there was something about the tone or context that would imply a less favorable interpretation -- YMMV.