Would you like it if people pick up one aspect of you, one wrong thing on ya, and name you after it, like you big nosed, or left-headed? would you like it? would you like people forgetting your name and called ya by your new stupid nickname?
No, of course not, then that's how people feel when you  call them "3zi"/ "3zia" not as an implicit insult, but just to say 'that one coloured guy / girl'.
YES, I am 3zia and proud, but being called in such a way by my friends, even as a joke, even as a compliment, is not that pleasant, not that I am ashamed of my own colour, but it's just annoying.
Yours,