I don't hate Justin Bieber because of "bandwagon hate". It's because he represents everything wrong with the modern music industry.
By raising the argument that people are insecure for voicing their opinions over something, you leave yourself open to the argument that you're so insecure that you need to hide behind a construct of pop culture just so you can desperately cling to a community of people that share the same shitty taste in media that you do.