How did you type this entire comment and not realize that mansplaining and manspreading are two different things?
This terms are based in the --false-- claim that [all] men are dominant and [all] women are passive and unable to defend themselves from the big-bad-male. They aim for a society uniform when people will have much less margin to be an individual, and people with long legs or that weight different will be ashamed for that. Both terms, mansplaining and manspreading evoke a very dystopian feeling.
But if this is the kind of society that you wish for, feel free to spread the sticky mess