My personal impression is that self-launching sailplanes are slowly becoming accepted by the "pure" sailplane community as a "necessary evil," given the realities of finding aero-tows and winch-launches in the USA. Once you get into touring motorgliders, which have the ability to cruise cross-country under power, the attitude changes to, "Oh. You're one of them." If there were enough people flying all the types, they'd probably shake out into two separate groups on their own. Unfortunately, I don't think there's a "critical mass" of motorgliders to really develop their own sense of community. They end up "scabbed on" to the "pure soaring" community, and roundly ignored for the most part. If a bridge could be built to the regular power-plane community, that might be a better fit. That's a matter of educating power pilots that turning off the motor is not tantamount to suicide.