damn, I feel like I am in sociology class.
I have never felt that my sorority is superior, just that it was the best FOR ME. If there was another group that needed my help, I would help them in any way I could, short of shooting my own group in the foot of course. There are things about my sorority as a whole that I have come to love, but truthfully I joined because of the girls in my chapter. If those same girls had instead been ADPi, KKG or ZTA, I believe I would have found things to love about those groups.
What you seem to be saying is "TKE is the best, nothing else matters." I don't know, maybe this is a guy/girl thing.