Stereolab VS Sonic Youth

Yesterday I had a conversation with a friend, who is not really awared of music, but who is completely in love with Sonic Youth and related stuff. The problem was that he was 100% sure it's the best band ever and I don't get anything in music. At least I could call The Groop's early stuff against them, but being extra-underrated & unpopular band they could hardly win in that dispute.

Being a music jerk-off when I'm only 22 is quite hard, I'm in love with music since I was 13 or something. I listened to The Groop for a first time when Sound Dust came out, or even earlier. Collecting, organizing, listening, safekeeping of cds, mp3s takes a lot of time and power. And I have no idea how to dispute with people about that. I'm truly in love with music, and never set myself up for super cool because of it. I do it just for my own joy.

I try not to speak with people about music, but when I meet the person who's just read some shit on pitchfork and tries to prove something instead of accepting the fact that I'm awared a bit more, and well, I actually don't care, is confusing.

Moreover, that guy was closely confined, I'm pretty sure he would never listen to the stuff without guitar sound or so on.
How do you behave when such jerks want to argue with you?