"But I don't like dark beers."
I've heard that comment countless times. Usually that can be loosely translated into: "I've had Guinness once. Hated it."
A minority of the time someone has also tried some newfangled big american stout and dictated that it was "too heavy" for them.
Try these. If you don't like any of them then come talk to me. And seek counseling.
* Sam Smith Taddy Porter
* Ayinger Celebrator Doppelbock
* Ettaler Curator Doppelbock
* Monschof Schwarzbier
* For those who like really "lighter" tasting libations - Ettaler Dunkel