Tolerance is a two way street. It also means accepting minor things you necessarily don't agree with. These topics are blown so far out of proportion that they are actually hurtful to workplace and gender equality.
This is a slippery slope...
Not yelling "NIGGERS NIGGERS NIGGERS" doesn't mean your project turns into homogenous gray sludge, indistinguishable from all the other projects. If anything the projects that fling slurs are less distinctive - they're all so stupid that they limit themselves to English slurs so they end up with a very limited set of insulting terms. If they want to be hrave they could see all the stuff that's illegal in various countries and include those concepts. They should start insulting the ruling family of Kuwait, for example.