Miley's live singing voice and Gaga's (assorted) speaking voices when she does interviews. Especially the ones where she tries and sounds British and pauses heaps between her words as if she's saying the most profound thing since I Have A Dream when really she's just rambling about soup cans or something.
Britney Spears - I hate that stupid, childish cooing thing. The Voice for paedophiles when she was younger., really creepy now she's a 30-something year old mother of two.
Mariah Carey - she had great technique and a technically impressive voice, but if I want a dog whistle I'll got to a damn pet store. So over-done with all that damn WAILING.
The absolute worst is Nate Ruess. 
