I'm not a big Amanda fan to be honest. I didn't used to mind her, but since noticing how rude she can be, I've gone off her. Looking back, it's always been there (like with how aggressively she rejected that guy who couldn't sing in an early series), and last year when she got all offended when she saw her "lookalike". Granted, the didn't look like her, but no need to be nasty. I'm sure someone said she said "she's fat" too, she she was nowhere near.
David's "Oooh, me and Simon are GAYYYYYYY" thing is pretty tiresome by this point, but he seems decent enough so I'm fine with him coming back.