Self-censorhip is a thing, but its pretty much a good thing. Why? Because, without those nice internal censors, we'd be saying whatever bullshit pops into our heads without thinking. Communication would be difficult bordering on impossible, or at the very least incredibly frustrating. Think about it: let's say I get, for whatever reason, the desire to call my brother a cuntwhistle. Now, let's say my brother is the kind to be offended by that (my real brother isn't, but that's neither here nor there). I could call him that, cause a fight, and generally have a bad time. Or, I could NOT call him that, thanks to my internal censors telling me that its a stupid idea, and I avoid said fight. Nobody's hurt, and we move on with our lives like reasonable adults.