No reasonable person would discriminate against an artist due to their age. I hate her because her music is boring and bland.

She doesn't promote her music, her label does. Clothing doesn't affect music.

Who cares if an artist promotes or is against drug use? It doesn't affect their music. 

She's obviously an industry plant, like pretty much every mainstream musician in the past 25 years (yes, I am aware there were industry plants before then). Her personality isn't 100% genuine and is used as a ploy to sell albums to kids that identify with her portrayed character.

She makes pop music. Clothing doesn't affect music. Many pop artists use dark and depressing themes in their music (Brian Wilson, Jamie Stewart, etc.).