So different cultures denote different races do they? Better write to the dictionary compilers and let them know that.
Or do all English people go to Glyndebourne and Covent Garden? Obviously they all attend the Church of England every Sunday too.
There is more to arguing one's corner than rebuttal via a set of conditioned responses.
Just stop a minute, and think of all the cultures that exist within the boundaries of these islands. Having done that, address the point that fashionable phrases place unnatural constraints on the interactions of both peoples, AND races.
G.