Yep. Whenever I say I am colourblind, people show me a tree and ask "what color is it?". And I have to explain that I know what red/green is.

An example I give is red flowers in green grass: I may not see the flowers at all unless I go very close.

Another one is while climbing indoors: say there is a purple route next to a blue one. Some handles I will clearly classify as blue, some clearly as purple, and some in the middle I won't be able to classify. But non-colourblind people will clearly be able to classify them all.