Some folks will never understand. You can disagree with Rudy on issues such as abortion, immigration, etc. but you will probably not understand that Rudy almost singlehandedly destroyed the liberal power base in NYC across the board.
From the NY Slimes to the mob unions to the teachers to the one party socialist politicians. And they hate his guts for it.
Or do they hate Rudy for taking the place of the mob bosses and politically corrupt? You do know how many people he surrounded himself with who were later indicted for crimes, right?