My mum, who died last month aged 91, always referred to "coloured people," though she didn't have a racist bone in her body. She still hadn't forgiven the Germans for WW2, however, and booed when we drove past Lidl :-) It's always been an awkward terminological area in the UK and it's far better to try to glean the sentiment of the person using the "incorrect" term than to go for their jugular. "Person of colour" is a clumsy expression but at least it's a catch-all that seems to have become acceptable lately.