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"Men don't say 'breast'"
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Or maybe more directly, referring to breasts as "breasts" does not in an absolute sense disqualify someone from being a man.
Even if this seems trivially true, it doesn't stop people from taking generalizations (like men typically say chest rather than breast) and applying them in either a policing fashion or in a disqualifying / gatekeeping fashion.
OP might just need to talk to the therapist about the comment and walk through how they experienced it.
In voice therapy a trans person might intentionally train to mimic common stereotypes in gendered speech patterns, sometimes it's just pragmatic and useful to be clued into those gendered generalizations to help pass - we don't know if the therapist was trying to likewise be helpful and accidentally came across as policing or gatekeeping.
Wishing you luck OP!