I think that the motivation behind it is very simple: no one gives a shit about what I go through, why should I give a shit what you go through?
I'm not saying it's right, but there is a twisted logic to it and there are certain societal factors at play that do make it seem true (like young boys being much more likely to be suspended or expelled from school).
Again, I'm not saying we should stop fighting for women's rights — rights for one are rights for all. I'm just saying, understanding instead of trivializing will be what leads all of us out of this mess.