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Let's say you have a party at your house.
Someone at the party starts insulting you and everyone else there, and ruins the fun for everybody. Maybe they start harassing people, even. The mood sours, people start leaving because they're not having fun, and they think you're a jerk for letting THAT jerk have their way.
You tell them to quit being such a pest, or they can leave your house.
That's "censorship" and "totalitarian dictatorship" according to you; telling a guest in _*your house_* that its _*your property_* and they can either abide by your rules _*or leave_*. Having rules for people to follow while they're making use of your property does not equal a "totalitarian dictatorship."
"Freedom of speech" doesn't mean you get to say anything you want on someone else's private property without repercussions.
Nobody HAS to allow you to post here (or any other venue, Facebook etc.). We're all guests here, none of us entitled to use Derpibooru. This isn't about your _*rights_*, which is what "freedom of speech," "censorship" and "totalitarian" imply. Posting here, or on any other webites you yourself aren't hosting, is a privilege and not a right.