Jennifer Lopez - She has a pretty ugly personality, limited range, acts poorly, and her music is just OK.
Demi Lovato, Selena Gomez, or any other Disney girl.
Katy - I used to stan for her, but she disappointed me greatly with her latest album (and her silly antics)
Miley - grosses me out and annoys me.
Avril - hate her music, image, and personality.
Gaga - Too pretentious and delusional. I like her pre-BTW music though.
Katy - I like her music but she's the type of entertainer to enjoy casually, not stan for.
Selena - not talented in any capacity, annoying Bieber drama.
P!nk - hate her voice, music, and attitude.
Demi - music too boring.
Also current Britney is impossible to stan for for self-explanatory reasons. But the young Britney I grew up with slayed.
Anyone who is essentially basic. I don't love all the girls all the time, but I at least respect anyone's stuff if they are at least interesting with their sounds and imagery.
If someone produces tacky, or worse, boring material then I just cannot stan.
With that in mind I voted for:
Avril
Kesha
Rita
Miley
Alicia
Pink
Kelly
Taylor
Demi
The first 4 fit in the tacky category (for me) and the last 5 in the boring one.