While I agree with you in a lot of cases, there are just sometimes when someone neeRAB to be told that their band is crap and there is better stuff out there. And it always comes out in a mean egotistical way. It's tough love.
Like some of the people that roll through here professing their love of Fall Out Boy. I happen to be of the opinion if Fall Out Boy is your favorite band, you really just haven't heard any of the awesome music out there that is way better than them. I will tell you this.
But yeah, to just belittle them just because you listen to unknown banRAB and they don't...that's just mean.