How's this for DT cockblocked: I took a girl to her first DT show, only to have Derek hit on her and pick her up. True story.
Really?! Holy crap.
Also, one lesson I've learned when it comes to DT and girls... Don't ever mention to a girl you'd like to get to know that you listen to DT. Wait until something solid has been established.
Is DT really that well-known? In the circles I move in no one has ever even heard about them. To my friends (or girlfriend) they might just as well be my imaginary band, seeing as I'm the only source of information regarding DT they've ever ran into...
And if your romantic interest/partner doesn't like DT, that's no reason to end a relationship... Everyone likes different things, in the end I think it all comes down to attraction, being happy together and accepting each other's flaws...