This argument is used as a pretty classic motte-and-bailey. You put forward the idea that intolerance is the only thing that must be excluded, expressing it as

This argument is used as a pretty classic motte-and-bailey. You put forward the idea that intolerance is the only thing that must be excluded, expressing it as blatant racism, sexism, and violence. You then slight-of-hand intolerance to mean an ever increasing list of "problematic" behavior as defined by a small group of vocal political activists. When people argue with this (the bailey), you retreat back to the motte and call them a racist. It's also fairly amusing that a group adhering to a political doctrine that notoriously ignores falsification love to trot out (a tortured interpretation of) Karl Popper as a meme.