What s rude is the shared imagery not the words. If I call myself MyDirtyDickInYourDogBringsMeToOrgasm, imagining this scene is disgusting enough to ask me to change it.
Words are not just symbols on paper, they are image triggers in your brain.
If someone attempts to degrade someone's emotional or mental state, that's something that should be stigmatized. But, that doesn't mean that the individual is not completely responsible for his own mental state, in the sense meant by Stoics. It's not about things, but our thoughts about things, which are ultimately under our control. We may play the victim, but we'd only be fooling ourselves.