It means that usually only men use that form. Imagine the ‘big boss’ stereotype – very gruff, easy to anger, laughs loud, expects obedience from everyone – for the image of “quite masculine”. I’m exaggerating, of course, but in that direction.
It only reflects on the speaker, so it wouldn’t necessarily be bad to say to a woman, just kinda rough to hear. It could be said by a woman but it’s probably very unusual. (I’m not saying anything is absolute in this day and age.)
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I can’t understand when I should use んだけど instead of just けど, they both look the same to me