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In case you’re being serious, this has been debated in various liberal traditions since the conception liberalism was first born. In essence, the modern liberal tradition (modern as in post-Enlightenment, i.e. about the whole time America has existed) says you don’t censor anything except for forces seeking to censor (paradox of tolerance).
Better minds than mine have debated the paradox of tolerance (a name only given in the 1950s, but a concept recognized for longer).
Also, not tolerating something doesn’t mean forcefully censoring it. Norms and conventions largely keep e.g. frowned-upon slurs out of common usage. The person getting told to shut up for using the N- word isn’t being censored by the state, but they are being encouraged to engage respectfully.
One, not my experience. (Indian family.) Two, people spouting out the N- word have generally caused themselves to be ignored, which sort of solves the problem as well.