It's interesting that you think referring to someone as coloured is racist, but referring to them as Black is OK.
On that basis, what is your take on the John Terry incident?
'Coloured' needn't be racist, Hansen wasn't being racist when he used it. As has been covered here its how the word is used that is important.
What did Terry do, call him a "black bastard"? Definitely racism isn't it, the word is acceptable in the right circumstances but not when used negatively.