Even though I dislike Heather A LOT, saying that she's not pretty is a rather mean thing to do. There are plenty of other negative aspects to focus on.
On a similar topic, did you ever notice how when someone doesn't like a woman, their physical appearances always have to be dragged into the conversation? I don't see anyone mentioning Paul's looks. They did the same thing with Linda. Oh, let's call her a dog, ha ha, so funny. :
People always have to mention how female stars have lost their beauty... Lauren Bacall is one that comes to mind. But you never hear anyone going on about Eric Clapton or Bob Dylan.