it happens on both sides I've had both men and women explain things to me in a condescending or patronizing tone. I agree with aarongmunoz I think its probably an ego thing that people have. I've never understood wrapping up condescending or patronizing into a word like mansplaning when almost everyone does it anyway lol all that said I've lived a pretty secluded life (intentionally) so i'm probably ignorant to the situation in general.