You can't be a hipster without only loving music that nobody else has ever heard of. It seems to be one of the most important part of being a hipster. Suddenly, bands that achieve mainstream success "are too commercial" and their music ceases to be enjoyable. Weird. I guess it's just one of those "hipster-isms" that you need to accept to be a hipster.
See, it's not the desire to discover new bands for the purpose of getting their music out for the rest of the world to hear that drives this need. No, in fact, it's quite the opposite. The hipster seems to only be happy if they know something you don't know, but as soon as you know it, it's no longer hip, and thus ends the hipster's infatuation with that band.
This video is great, with the only exception being the part about Two Door Cinema Club that the crowd seems to get a big kick out of but the band does actually exist. Although I'm quite certain they never made an album called DJ Cornmeal ...