He drew the line to say we have to be able to use words so that we can talk about the issues themselves. If we ban words from being said then we're not going to make progress on the issues.
Of course it's not super deep, but we don't really have been with for those types of conversations of people are screaming at each other. It's clarity and geometry of the playing field for building rules for coexistence.
It hinges on a strawman that there are those who are trying to ban words when the opposite is occurring; the debate is around
expanding the definitions of certain terms.