As for the Fightin' Whiteys and their shirts, the quote covers all the relevant differences. The Whitey are the majority and some/most in the area feel no particular compunction about the name being used by a minority group for profit. Its benign enough to, literally, buy into. Also, while Whitey might very well be used in a derogatory sense, there are multiple positive examples of it. Unless you are describing a potato, its not really an analogue for Redskins.

I doubt the same reaction would be had if that team was named the Fightin' Hibes or Fightin' Kikes.

The Redskins are not about to hand over a portion of ownership to Indigenous Americans nor are they currently sharing royalties over their trademarks.

Skinbasket Clone may feel that no disrespect intended washes his hands clean, but he is only one end of the communication. In a commercial enterprise, the intent of a consumer is pretty irrelevant.