I doubt Fluttershy is manipulative. There hasn't been many hints on that. Fluttershy does have a job, it's taking care of the woodland creatures. She also has a chicken coop and raises pigs, for eggs and *ahem* truffles. Fashion and partying can make money but Flutters wasn't talking about money when she said pointless pursuits.
Taking care of animals (Fluttershy)
Planting crops (Applejack)
Researching (Twilight Sparkle)
Controlling weather (Rainbow Dash)
Are jobs Flutters sees in higher regard. I'm sure this is how she feels. But it's not to be heinous to think that way, all the other ponies don't care about the jobs other ponies do, I'm sure Applejack feels the same way about Rarity's obsession with fashion. The difference was Applejack didn't stomp all over Rarity's integrity. And to have someone they trust more not to attack their emotions like Fluttershy it would of been more hurtful.
Fluttershy had less experience with being assertive so she couldn't restrain herself.