It isn’t only men, it is just the biggest group.
Us men are taught that our opinion is always valuable. A noble goal I am sure.
But women still get too many “go back to the kitchen” comments whenever they give their opinion. From the more sleazy and sexist people around.
Yes, every person has the potential to mansplain, but the group that gets attacked for it the most (even if it is not called mansplaining) tend to do it less.
Us men are taught that our opinion is always valuable.
As a man I’ve been told no one wants my opinion since the 2000s so I’m not sure where you’re getting this from.