DrPete 

All of the above recommendations are fine and good, but I'm sure that these noob riders aren't showing up to your rides thinking "I wonder how I can break up this paceline." There is a certain amount of ignorance about how to ride in a paceline, and I'm sure that most riders who try it for the first time aren't trying to do anything malicious.

So, sure, educate them. But why yell? So you had to cover a bike length because someone dropped back early. I thought you were out there to work! Same goes for the rest of the stuff.

Bottom line is that there's a constructive, helpful way to teach someone something, and the snippy, snobbish, hostile way that makes people think you're a snob and hate the fact that they came out to ride with you. That's why people might think you're elitist--not because you ride in a paceline.

The whole "get it right or we're going to yell at you" a$$hole attitude is exactly what you claim it not to be--elitist. No egos? How about the entire group that chooses to intimidate the noob?. How about an experienced cyclist who tries to take a noob under his wing and instruct as they go? Might be more helpful than what you're doing...

DrPete