"Positive Masculinity" cannot be defined by women. It's something that has to come from inside our own masculine soul, to be true.

You cannot define something that you do not own. If I, a man, would define what it means experiencing menstruation, I would be - justly - ridiculed.

The funny thing is, feminists deny men defining femininity... yet they think they have the right to define masculinity to their own terms.

Of course that's in line with the whole "feminist equality": "Women can, men cannot".