It's offensive to him that you like what you like, and not the very specific list of rock greats that have been signed off on by magazines and critics and halls of fame.

It's all an appeal to popularity and authority, but can they admit that "Hit me baby one more time" by Britany Spears a banger? Certainly not! Pop trash! Never mind that it has more interesting elements than the average Dylan song :P.

You are an elitist for disliking Dylan! Also, what you like is actually bad, so you are also dumb. A dumb elitist!