Consider the scenario where you meet a man. You know his name is Bradley (either through mutual friends or whatever), but he introduces himself as Alex. You can call him Bradley, and it would be technically correct, but it would be slightly rude when he has explicitly given his preferred name as Alex.
Consider the scenario where you meet a man. You know his name is Bradley (either through mutual friends or whatever), but he introduces himself as Alex. You can call him Bradley, and it would be technically correct, but it would be slightly rude when he has explicitly given his preferred name as Alex.