I had nothing to do with my chapter for several years after graduation.
Why?
I came back to help out with rush the year after I graduated. (I was a grad student at the same school.) The rush chair specifically asked me to wear something different from the actives (she asked me to wear letters whereas the actives were wearing white shirts and (I think) jeans). So I show up in my letters, and the chapter president nastily says, "Where's your white shirt?" I tried to explain to her that the rush chair had asked me to wear letters, but she would have none of it, and
demanded that I call my then-fiance and have him drive down with a white shirt for me to wear.
Needless to say, I did no such thing!
Active members of any GLO
have to show respect to the alums. Otherwise, why should alums volunteer their time and/or money?