Wikipedia is an encyclopedia. The right to free speech applies to opinions, not the facts we're supposed to see here. There is freedom of speech to a certain degree on talk pages. But there are some things that are clearly unacceptable. Racial slurs and namecalling are two such things. If a majority of users consider a phrase offensive, that should be a clue not to use it. Anyone who still calls name after receiving warnings brings a block upon themselves.
Mgm