Also widely used outside of the Midlands to refer to an individual from any part of the West Midlands region. This has an empirical basis since the most distinctive traits of the accent are common throughout the region.

Even used in this sense it's generally not taken as derogatory (even if it's often meant as such). The exception is people who don't consider themselves Brummies - either because they have a local identity distinct from Birmingham (like Black Country) or because for whatever reason they prefer to deny their Midlands heritage altogether.