What point are you actually trying to argue?
It looks like 'Reddit = good guys, Mumsnet = big fat meanie women = bad guys'.
That's the same Reddit, btw, that had a sub called 'Guys Should Rape' where men were allowed to share their rape fantasies, where actual rapists discussed their rape of women, and where wannabe rapists detailed their plans, and others asked the actual rapists for tips on how they could rape 'sluts' and then terrorize them into keeping quiet afterwards.
Want to know why the sub was banned?
Because rape is illegal, maybe? Because rape is vile? Because it was a hate sub encouraging violence against women and girls?
Nope. Because it was unmoderated. They banned it because it was unmoderated, not because of the content.
And there are plenty of other horrific subs that are moderated and allowed to stand on that lovely, progressive, good guy Reddit.