Parvati felt like she was on fire, she was so angry. Every part of her hummed with absolute rage. "Plain? Oh don't even-" As if Parvati Malfoy could EVER look plain, "-try that! Unless of course you've blinded yourself by one of those stupid candies of yours."
She was fighting very hard to stay calm. It wouldn't do for anyone to see Mrs. Malfoy lose her shit and hex the crap out of George Weasley in front of Honeydukes. The only problem with that is that George was one of two people who could anger Parvati beyond the possibility of being cool and collected. Ironically, the other was her husband. You have more in common with Draco than you'd like to think, George.
But at the fat comment, Parvati couldn't even TRY to stay calm. Heart shaped lips dropped open into an O and she reached out and slapped (yes, slapped), George across the face. "You BIG GIT!"
Fortunately, no one was around. Except for a squirrel that looked a little terrified by all the humdum.