Would he only consider himself successful if he were to completely change everybody's opinion to think that the nickname IS hostile and/or abusive?
I'd be curious to see/hear examples of the so-called "hostile community" that the nickname perpetuates.
It could also be said that it's a small group that opposes the name that is speaking for masses. I don't know the answer to that, and I'm sure many here don't, but from other word-of-mouth that I've heard, it's the latter, rather than the former.
Does he know of one Sioux Tribe that is completely AGAINST the name?