I have absolutely no problem with someone who believes that the term coloured is patronising or that it isn't used among young people. The problem I have is when you act as the voice of the younger generation based on your relatively narrow experiences.
The difference is that I am not pretending that my view is the view of all older people, nor am I pretending to speak for all of those over a certain age. I know some of the younger generation who use the term coloured (just asked a relative of mine in fact who said she uses it) so there you go.
Don't make the mistake of thinking that what you and your mates believe is the definitive beliefs of 'the young generation.'