Hey, think of it this way Rarity. In a way, they're comparing you to Charlize Theron while they're comparing Fluttershy to Kristen Stewart. Weep for the horrible ways your friend was just insulted. Not even Fluttershit deserves to be compared to Bella Swan.
...Wow, that was both poorly worded AND poorly thought out.
Even I needed a minute to remember who those actresses were.
I mean, couldn't you do something timeless like, "Look at it this way, Rarity: You get to live in a castle, while she shares a hovel with seven short hairy guys waiting for a necrophiliac prince?"
Meanwhile, Rarity is clearly the costume designer for this little production, and Fluttershy is stacked for wardrobe malfunction, so we have both the means and the motivation. What's that? "Opportunity?"
Hey, until Stephanie Meyers is crucified for her work and society collectively gets past garbage like Twilight, 50 Shades of Gray and pretty much anything Michael Bay is associated with, insults towards Bella Swan, even if it's by proxy in insults towards Kristen Stewart, are worth making.
Though if you want to get what i was referencing, look up Snow White and the Huntsman. CinemaSins has a good piece on it.