I think that any statement where colour is mentioned but is not relevent to the statement is racist.
There are 2 types of racism, imo.
1 - nasty - hurling abuse, thinking someone is less human than you, violence etc
2 - ignorance. "I had a chat with a lovely black man yesterday" for example - adding colour where it is not relevent.
If I wanted to show someone which was my husband and he was sitting with a group of white men, I could say - the one with the jeans on, or the bald one, or the black one, depending which would single him out (if they were all wearing jeans, or several were bald for example)
It is racist to add someone's colour much of the time - I was talking to a nice black man - you wouldn't say "I was talking to a nice white man" would you? You'd just say "I was talking to a nice man" people (white people) don't mention colour when the person is white, but mention it when the person is not. That is racist.
So many people are ignorantly racist - like when that high ranking policeman said "All british people are racist" when he meant all white people are racist (which is wrong anyway, but never mind) He showed his own racism by his unthinking british = white attitude. He was meaning to be anti racist, amusingly, but showed himself up as the oppostite.