BRTD's insecurity about his own beliefs and taste drive him to overcompensate by obnoxiously inflicting those opinions on others so that he can blame the widespread social rejection of his foul preferences on his behavior rather than the preferences themselves.
The funny thing is most people I know in real life who aren't into my music like my co-workers or older people at my church tend to assume I actually have great taste in music because I go to shows all the time and have such a huge record collection and it's usually bands they've never heard of so they assume I'm some sort of esoteric connoisseur or something.