I'm not talking about giving someone credit where it isn't due, but good old fashioned respect for other martial arts practitioners, particularly other instructors.
I've got a lot of friends who practice other martial arts, and when I've been introduced to their instructors, I'd always refer to them as they were introduced to me with their titles, such as "master", "professor", "mestre", "sifu", etc. Granted that they were my friends' instructors, and not mine, I still felt that it was the respectable thing to do.
In contrast, I've had friends outside of martial arts who say that they'd never do that because that person never taught them anything. Am I going overboard with the respect thing?