The single best thing about music is that it's all subjective; what's 'a cancer' to you, might be the song that helped someone get over the death of a loved one, or whatever. Do I like the music in the charts today? No, but then I'm not really the target demographic. It's also fairly easy to avoid the mainstream charts nowadays; I couldn't tell you who's number one in the charts, or even list, confidently, 10 artists in it. I don't really care though, as long as people are getting enjoyment from listening to it, and neither should you. I'm more annoyed about people like you who try to impose their musical opinions on everyone else, whilst belittling others opinions.

TL;DR: Who cares what other people are listening to, as long as you enjoy the music you yourself listens to.