I could waste my time writing a whole essay but...
People have different tastes of music whether you like it or not. Some people do enjoy listening to auto-tuned people and that's their rights. I shouldn't expect anyone here trying to repress someone's rights through peer pressure saying that if you listen to Nikki you have bad taste of music (although that's an exaggerated way of saying of what most of you guys are saying). I personally enjoy iggy as an artist. She may not be the greatest singer, but I still find it really catchy and I may not enjoy Nikki or Justin beiber, but a lot of people do and that's their choice.
Tldr: Pessimistic thread mean, people telling others indirectly which songs are bad or good. Very bad.