I'm guessing you like metal? You're not correct here and plenty of pundits who have listened to a ton more music will agree. Run along now, little green. You don't have a point to make.
I grew up listening to alternative music, and Radiohead's simply 'okay'. I don't know why you have to call this person a metal fan or a "little green", whatever the hell that is, just because he doesn't agree with your Radiohead fanboyism. I'm sure Radiohead would happily exist on any "top 100 bands of the past few decades" list, but to throw them straight on the #1 spot is simply not going to be universally accepted.
Edit: Oh, now I see, you're complaining about the useless Bieber and Gagas of the world, so you're probably a small handful of years younger than I am. There were plenty of fantastic bands that predate the Bieber/Gaga era. I think your frame of reference is a bit narrow.
Ok, so the guy who comes in out of nowhere to call Radiohead overrated (which, if you care anything about the vast majority of the music critic world, is at least GOOD) and that's totally cool to you. I'm at fault for showing him the door over a pointless comment.
Now here comes you to his rescue, you white-knight you. You also seem to have an opinion worthy of a music critic ("okay"). That's great. Good for you. Go read some critics' opinions and go tell them they're all wrong and you know good music when you hear it and that Radiohead is just "OK". I really couldn't care less if you think another band is #1 or if a critic does -- just GENERALLY SPEAKING, Radiohead is probably the #1 band of the last 20 years. If you can find critical reception to another artist that is just as great if not better, good then you beat me.
Then there's me, oh poor me who doesn't know anything about the music world and thank God you're here to correct me. Just by your opening sentence ("I grew up listening to alternative music"), I probably have listened to 5x as much music as you. I've been in love with music since I was 13 religiously downloading and listening to as much as I can. You have no idea who I am, but you feel compelled to defend a pointless comment so you can patronize me.
For what it's worth, most people who don't like Radiohead or call them overrated, in my PRETTY DECENT amount of experience of talking with music lovers is that they're usually into metal. That wasn't some attack you overly-sensitive man, you.