Couldn't this be true for any group though? Not to lessen what she's trying to say, but if you're in any way a minority in a field, aren't you in some way representing that whole group?
If a work mate is a member of the Jewish/Mormon/atheist minority, I may not even know. And if I know, it's easier to forget. If I am a man (and I am), I am not gonna forget that the person next to me is a woman.
It may be also true of, for instance, rate. There was no black people, and very few Asian and Latin American, where I studied and in most companies I've worked for.
I, of course, don't consider myself a bigot (who does), but I guess I'm as likely to hold that kind of bias against black people than woman. Or significantly more, since I have worked with several women, and I have never worked with a black person (obviously not American).
(Answer: no. Same with anyone, regardless of minority status. Just because I'm a member of a minority doesn't mean the entire minority is homogeneous.)
So, no I'm not suggesting that I represent all men. I'm saying it's possible a male nurse may in some way be representing all male nurses to his female nurse coworkers.