I only really hate one club and have done since the 70's and that's Man United. This stems from when they used to take over Highfield Road when we played them,as they had their own fans but in there were Cov "fans" who would support them on that day.
I remember one game when about a hundred of us who stayed loyal and wore the Sky Blue were shoved down into a corner of the West End and took punches,spit,and abuse,and so is it any wonder I detest them. And I despised the turncoats too !