I appreciate your service to our country, but you don't get a pass nor are you the final authority on a word because you suffered a brain injury in the military. Together, if we can help rid our community of hate speech and derogatory behavior, why wouldn't we? Do you condone or even prefer toxic environments?
The 'r' word in question is viewed as demeaning and insulting. Plain and simple. There are many other words in our language that are no longer acceptable.
Are you going to try to justify the use of the 'n' word or 'f' words too?
Times change, words die. Let it go.