I love my: back (though I don't get to see it that much!), shoulders, and arms (when they are toned, which is not at the moment because I've been slacking, and they need constant discipline!).
I won't say hate, because I've gotten to the point where I don't want to hate anything about me. I'll say "would like to see improvement" in my "belly" (I don't have full abs, except on the upper part. But a "belly" is a very attractive feature to my cat Bobsie, who loves to knead it in the morning. How can I take away that pleasure from her by getting flat lower abs?). Also, that dreaded "thutt fat" area, which I've always had to some extent. But since these are both areas that I've always had "trouble' with, it's kind of senseless to hate them. Kind of like hating whatever height you are, or what age you are, because you can't change these things (though I know I can "improve" the gut and butt areas).
Also, more recently, I am struggling with my tricep area, which seems to want to flap away in the breeze at the slightest laxity in my arm workouts. At one time, there was more flappage, which really bothered me because I felt it when I would write on the board (and since I'm kind of a neo-ludite when it comes to teaching technology--chalk talks are my friend--I had a pretty constant reminder of the situation.