I think we can assume that Napalm Death vocalist Barney Greenway probably doesn't like Justin Bieber's music much, but he did use the pop star's image as a protest to Russia's anti-gay laws when the band was touring over there! Greenway explained himself in an interview with Noisey:
"Yes, I do have one, I wore it in Russia because I thought it looked quite effeminate, and I wanted to look quite effeminate because they just passed that stupid law to ban promotion of non-traditional sexual practices. It’s quite silly, and I wanted to let them know how stupid their law was."
Obviously Russia is really easy to piss off given that concerts in the country have been banned in the past because of religious stuff, so it's probably only a matter of time before concerts get banned for "being too effeminate."