Retailation for trying to prevent discrimination against others

I am faculty at a private university. Last year I actively sought to stop what I considered to be discrimination against minorities in our admission process. My activities included filing a complaint with the University. This year the Dean took me off the admission committee, saying that I had no entitlement to that assignment, that my activities last year had been an impedement to the process and specifically mentioned the complaint to the University as problematic. In addition, to taking me off the Admission committee, she gave me two assignments which are on the lowest end of importance in our school. One of them is essentially a clerical function - arranging scholarly workshops. Can I make a claim of retailiation even though my complaint about discrimination was not about discrimination toward me but discrimination toward others?