I used to be an Arsenal fan when Wenger lead Bergkamp/Henry/Pires at the club. That was magical period for me, but I lost the thrill during the 2006 CL final. I had to pick my original side. Haven't looked back. I still wish good to Arsenal, but I don't care much as I used to do.
To be frank, the most I hated was Sir Alex's Manchester Utd side of the 1999/00. Chelsea and Liverpool come after that.