...to try and insult your music taste.
For me it would be: "Everything you listen to sounds the same" or some variation on that like "All you listen to is ragghhr raghhhr raghhhr stuff".
No...just no. What makes it worse too is that when you try and defend yourself it just makes you seem more desperate, e.g "No! Noo! I listen to like...calm stuff too like..erm..."