If their black, call them black, coloured is incorrect then, as it is a descriptor of difference.
But if you are referring people from a variety of ethnicities, what then? "Non-white" sounds far worse than "coloured".
but so is 'people of colour' surely - yet that is rather en vogue these days
tis more just because it is a term that was used in the past when race relations were bad
sort of like 'retard' and 'spastic' got tainted by playground insults etc.. 'spastics society' had to change its name to 'scope'... problem is that kids, being little ****s then started using the term 'scopers' to taunt people