Let me put it another way.
I run a 4E group. I play in another 4E group (different people). I also, until our DM recently moved, played in a 3.5 group pretty regularly.
Neither I nor any of my 4E players have, to my knowledge, ever attacked or criticized another D&D player because they played 3E or earlier editions.
Have I been criticized or "corrected" for playing 4E? You betcha. Often times, by the same people selling me the 4E products (such as one of the cashiers at the Jensen Beach Borders)? Absolutely. Sometimes, by some of the players in our other groups? Yep.
By the way, none of the examples I gave took place on RPG internet forums or at conventions --- where I would expect strong opinions about RPG systems. These little "confrontations" happen in the hum-drum of regular, everyday life.
I have received the distinct impression that certain players of older editions --- at least here in the Treasure Coast of Florida --- are very elitist, hostile, and accusatory to people who play 4E, even if (as in my case) they also play earlier editions, as well. I have yet to encounter any such comparable behavior by 4E players in my neck of the woods (which, incidentally, spans 3 counties in southern Florida).
Then again, I don't really go to conventions and I don't count internet forums as "real life". I suspect the situaiton may be different there.