You're rare!

My son said to me yesterday he may have an example of a truism which at the same time is a paradox. He didn't use the word 'truism' -- he spoke of "een waarheid als een koe", which is Dutch for, literally, 'a truth like a cow', that is, an obvious truth. But he did use the word 'paradox'. He's an avid paradox spotter and collector. The example in question is this:

Someone in class saying to someone else in class: "you're rare." (Dutch: jij bent zeldzaam)

As my son pointed out, this is obviously true, since everyone is unique, hence by necessity also rare. (This is a simple matter of scalar reasoning.) But 'rare' doesn't quite hit the mark in describing a person, as this qualification implies that there is more than one similar specimen (although there aren't many). So here's the paradox: since everyone is unique, they're obviously rare, but because they are truly unique, they can't be said to be rare!