When I'm walking around with Tri-X and shooting for myself, I agree, there is no such thing as bad light. I like recording the light as it exists.
But when I'm working it's a different story. Walked into a high school gymnasium last Friday to cover a basketball game and the first thing that hit me was, "When are they going to turn on the lights?" When I asked an official I was told, "This is all the light we have." So to get any kind of shutter speed for freezing any of the action, even wide open, I needed to crank the ISO over 10,000, which isn't exactly pretty, and still only gave me 1/500th of a second. Blurry layups. So yeah, I would say that was "Bad Light"