MCCOY: Spock, isn't it enough the commodore is famous for his hospitality? I, for one, could use a good non-reconstituted meal.
SPOCK: Doctor, you are a sensualist.
MCCOY: You bet your pointed ears I am.
-- from "Arena"
When on Mr. Byrne's Forum I pointed out that this scene and dialog was one of my favorites, he pointed out the "racism of Dr. McCoy". I argued that only McCoy, having worked with Spock long enough could get away with that line; Scotty, Sulu, Uhura, et al wouldn't dare try it.
Mr. Byrne disagreed strongly. In NEW VISIONS he has omitted those type of lines, removing some of the "charm", in my opinion, of McCoy's character.
I don't believe Dr. McCoy is a racist at all. He just enjoys his verbal sparring with Spock and Spock "tolerates" it a deference to the captain and McCoy's friendship.