A question for any "free speech absolutists" here: is there any speech that should not be acceptable? Legally, there are constraints on libel and CSAM, as well

A question for any "free speech absolutists" here: is there any speech that should not be acceptable? Legally, there are constraints on libel and CSAM, as well as speech “directed to inciting or producing imminent lawless action and is likely to incite or produce such action.” Can we at least agree on the foundational elements of that? I assume resistance to this is likely fear of a slippery slope, but there should be some area of consensus.