He could comment anything, including (textual) erotica and it wouldn't be child porn so how does it relate to this topic? Sounds like a slippery slope argument

He could comment anything, including (textual) erotica and it wouldn't be child porn so how does it relate to this topic? Sounds like a slippery slope argument that if we can cp, all speech is next? Is it possible cp is categorically worse than offensive text?