Do you have something that someone says to you, that you know they mean well, but really it just grates on your ever lasting nerve?
I do, of course.. otherwise why would I write about it? ha!

Mine is, "you have such a pretty face"

I have been known for the following reply:

Isn't it GREAT?! I can fix fat, but you can't fix ugly, can ya?

My sister and I have lengthy conversations about this. We both agree that we are happy that if something had to be "Wrong" with us, it's that we are fat. We both have very attractive faces, and some crazy personality to boot.
I am  the more outspoken one. I was the one growing up that didn't care when my peers would "beep beep beep" at me if I took a step back or two. you know the kind of sound a big truck makes when backing up? I didn't care when I got oinked at walking in the mall.  yes, people are mean! I just always consoled myself that the poor imbeciles had to do or say something to make themselves feel better. I have a "tough" skin.  I can take it, and it really doesn't bother me that much. what does bother me is I saw it affect my sister. She's a year older than me, and she was the sensitive one. Growing up she was always bigger than me (that's since changed) and the kids our age were even worse to her. There was one occasions this mouthy little punk said something to her. harrassed her repeatedly, and finally I just took matters into my own hands. vigilante justice. (though I do not endorse this type of behavior) I walked up to him and demanded that he apologize to my sister. He refused. I gave him one more chance, to which he refused again, and I popped him a good right hook to the jaw. He went screaming and crying like a little pansy. but ya know? he never said another word to my sister :)
ok, I don't know why I got off on that rabbit trail, but anyway... to tell a obvious fat girl that she has "such a pretty face" is a good intended INSULT!  Tell the girl she's "beautiful" or she's "pretty"  Just don't put "restrictions" on it by adding "face" to it.
Think about it like this.. when you see a horrible UGLY baby... if you mom raised you right, if you feel compelled to comment, or you feel forced too, you say (or at least I do) "What a SWEET baby"... or "oh, look how sweet"
This will avoid having hormonal post pardum momma bear go ape shit on you.
The next time you come across a "pretty face" either don't comment, or tell her she's beautiful, because if it's me you come across, I will head butt you with my "pretty face"