Bad in the sense that something has gone awry, or that someone has caused something to go awry; Messed up.
Bob - "Hey, did you just hit that guy in the face for no reason?"
Steve - "Yeah, so?"
Bob - "That's pretty darn Metric of you."
Comparing the Metric and Secondary (Or standard as some call it) measurement systems in America, we find that the majority of people are more familiar with Secondary, and as such 'Metric' is awkward, different, bad, or crazy. In this sense, 'Metric' can be used to describe the attitude or actions of a person, or something else that has happened that was unintended and harmful or unwanted.