I don't consider myself to be a DIR diver but the distinction is largely theoretical. Like chickdiver, I've experienced a wide range of reactions on the back end of dive boats, involving the DIR stuff that get discussed most on this board: the backplate, the long hose, the spring straps, the funny prone position, the bouyancy control, etc. Lots folks are mildly curious and only a very few have been openly disdainful. Oh, well. For the most part, life gives as it gets. Being friendly and polite usually smooth any situation, right? I don't proselytize, but unless it's time to get in the water, I'll usually answer questions.
Appearances can be deceiving both ways - sometimes the guy that looks like a total CF turns out to be more on the ball than anyone might suspect. I met a guy last year on a boat in North Carolina who was diving with a horse-collar over a beavertail wetsuit with an old Voit metal regulator and doubled steel 72's. There were a number of folks on the boat that thought he was a walking anachronism but I remember diving with that gear myself many years ago and we got to walking down memory lane together. It turns out that, despite his age, he was one of the best divers on the boat, of course. He was also one of the first people to dive the Doria when it went down and developed the original pony bottle because he wanted a bailout since they were still diving J-valves with no SPGs back then. Way cool, and I'm glad that his museum gear didn't keep me from talking to him.