Was at Game 4 and while I did hear a fair amount of "F- you Draymond," I didn't hear anyone using the N-word. I did, however, hear plenty of people apologizing to Golden State fans sitting near them for the obnoxious chants.
Can't say it didn't happen, but it seems awfully unlikely that any use of the N-word wouldn't have resulted in an immediate dismissal and likely shoutdown by all fans in the area, regardless of team affiliation.
Mike