I have found a difference in how people greet me while I am riding, depending on which bike I am riding. I have an unusual brand road bike (Kuota) so most roadies notice me and wave, even if I have a triple and may not be worthy of such a nice bike. I admit I don't always wave to everyone, but I do always nod my head or do something to acknowledge a rider.
When I am on my Jamis Coda, it's different. The cars give me a wider berth and are generally more polite. About half of the roadies wave and half don't. Now, when I am on this bike, it looks like I am commuting, with a pannier, lights, a rack, although I am usually doing an errand, going to an appointment, or meeting a friend. And, I am going much slower. But, I do have clipless pedals, a nice helmet, and gloves that sort of show I am a serious rider. On the other hand, I am dressed differently. When I ride this bike, I dress in my "fun" cycling clothes: skorts, capris like the Scooters, board shorts, or mtb shorts. I might have wool on the top in the cold weather and mtb tops with no pockets in the warm weather. Perfectly acceptable riding attire, but not roadie stuff. I feel perfectly fine either way; there's different purposes for riding. I always acknowledge people on hybrids and call out when I pass them. Last week one woman thanked me profusely for doing so, as she was riding down a busy street with her child. So, yes, there are a lot of snobs in cycling, but not all. When my son raced in high school, he couldn't stand more than half of the kids on his team, as they were already acting like a$$holes. But there were always very kind adults who took the time to mentor him. After almost ten years they are all still really friendly to me when I see them around town.