Elitism... I think this is an interesting topic for this forum, b/c generally, most of us seem to avoid elitist attitudes as best we can. But, CeeBee, Sensor, and Patman73 bring up some notable exceptions: RRB members tend to show a lot of pride in the "built, not bought" mantra, and RRB members tend to display a lot of scorn and derision at hipsters, roadies, and fixed gear bicycles.
Personally, there's stuff that I'm into, and stuff that I'm not. I don't think that has to do with elitism, so long as I keep it to myself. Steve used the word "accept" quite a bit in the OP; the fact that I might have higher levels of interest in some bikes, rides, riders, builders, or topics and a general lack of interest in others does not mean that I don't accept those other bikes, builders, rides, riders, topics, etc. A convenient example: I like and respect musclebikes, but I don't currently have a lot of interest in them. I know there was a recent musclebike build off, and I didn't participate or even spend more than a few minutes looking at the buildoff. I'm sure I missed a lot of interesting and creative bikes (no sarcasm intended, real talk) but I don't think that means I have an elitist attitude towards musclebikes. It doesn't mean i don't accept them. I totally respect them, and i appreciate them, but I'm just not into them that much.
I think, ultimately, elitism is a negative term that is sometimes used by folks with hurt feelings. I think that elitism's kryptonite is respect, and RRB is generally a respectful forum. I think that CeeBee is right that "built, not bought" is arguably elitist, but I take that to be more about pride than elitism. I guess a lack of respect for a "bought" bike is implied, but until we see a lot of posts about "your bike sucks, poser!", I don't think that pride in "built" bikes is really elitist.
We see criticism on RRB, all the time, but it usually comes when ppl ask for feedback and suggestions, and it's usually delivered respectfully. If someone says "I'm not happy with how this bike looks; how can I improve it?", we tend to come together and give objective advice without excessive heckling. Respect is maintained, elitism is defeated, and we all keep rollin'....
But, seriously, the hatred of hipsters confuses me. They're nearly extinct in South Jersey. On the rare occasion that I see one, I get all jazzed up about it, like I'm seeing a Bald Eagle or a Cali Condor or some other endangered species. 2008, I think, was the year of "peak-hipsterism". They've been in steady decline since then, and I think we need to encourage them before they die out entirely....