Distin (for no reason, stupid from us to boo him, all he did was leave a mid-table club for a club that was getting to Cup finals and playing in Europe)
James (wasn’t boo’d but had “David James, he’s under the thumb” sung at him haha)
Barton (while he was still a City player because he hadn’t yet signed his contract)
Dickov (because he dared to celebrate scoring a goal)
Sturridge (slapped arse bollocks from us to boo him)
Milner (didn’t at first, in fact got a good applause in the first games with Liverpool after he left, but now gets boo’d)
Plus likely many more…