I won't argue with someone else's personal experience, but I see no issue with arguing more abstractly about, particularly,
why things happen. What happens with one gender necessarily affects what happens with the other and has wider societal implications. Also feminism often seems to reach its own conclusions about men, how men experience life and how men should be treated - as a man, I feel perfectly entitled to argue over these points too.
You know, I actually had to explain to a young female colleague the other day that why, when it comes to selecting stuff for babies, it's no longer all pink for girls and blue for boys... I'm not at war with the pink for girls & blue for boys brigade, necessarily - it just amazed me that someone wasn't aware this is an issue.