It's all freaking opinions buddy. If you were to "lose faith in humanity" it should be because millions upon millions of people like Bieber, not because of one person. There's 2 things to distinguish here.
1) Being able to recognize good music doesn't mean one should like it. But you should realize there is talent in it, at the very least. For example, I don't really enjoy opera, but I know that the amount of training, dedication, and birth-given ability plays a large part of it, therefore it is "good" to me. You don't become a professional opera singer overnight.
2) Just because something requires a lot of talent, or technical skill, or above average musical interpretation, doesn't mean everyone is going to like it. I find fusion jazz (especially latin) and some extreme forms of death metal to be the most technical music out there, 1,000,000x more than the pop that floods charts today, but the general public prefers to celebrate mediocrity and one artist, rather than many. It's pop man, it's easier to relate to for everyone, even those who don't want or don't care to understand music, it makes them happy to listen in their cars or at parties, or bop to at a concert, just leave it at that.