picayune

picayune pic·a·yune [pik-ee-yoon, pik-uh-]
Also, pic·a·yun·ish, Informal

adjective

1. of little value or account; small; trifling: a picayune amount.
2. petty, carping, or prejudiced: I didn't want to seem picayune by criticizing.

noun

3. (formerly, in Louisiana, Florida, etc.) a coin equal to half a Spanish real.
4. any small coin, as a five-cent piece.
5. Informal. an insignificant person or thing.

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I've liked this word since I first learned it.  I've seen it used in a discussion to describe someone else's concerns and sometimes even their ideas or intelligence.

If they don't know what it means, then it means it's been used correctly.  Of course, THAT means you're being picayune by thinking that.