Truthfully, there has been a level of tolerance given to non-black groups who use the words and all of that stems with how close someone is with a black person for that behavior to develop.
Most non-white people who say it know to gauge who their around before it leaves there mouth, at least they have the respect for it.
Honestly, its pretty much zero tolerance with white people in regards to the history, however, there are plenty of cases of non-black who abuse the word as well. In my personal experience, Ive witnessed Asian Men being the ones to use the word as mockery of sorts.
Because of this, there is a wider growing sentiment of black people who are looking to reign in he word more exclusively. So while there was a time where it was kosher for brown skin to use the word, as of late its starting to reel back to those of Black ancestry.