split hairs

(verb) to be very exact and specific about something

Example Sentences:

When I got my wife a Diet Coke, she got mad at me because she wanted a Coke Zero. I told her not to split hairs.

Student: Can I go to the bathroom?
Teacher: May I go to the bathroom, you mean?
Student: You are splitting hairs.

From the Blogs:

Spinning and splitting-hairs

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