Split hairs
Definition 1 of 1
Pro Tip 1/3Decision Hindrance
Used when focusing on minor details could prevent making timely decisions or reaching a conclusion. 
Let's not split hairs on the color scheme; what matters is finishing the design today.
Pro Tip 2/3Informal Context
Common in casual conversation or informal discussions, not suited for very formal writing. 
I would help judge the contest, but I'm not good at splitting hairs over such talents.
Pro Tip 3/3Negative Implication
Implies a slightly negative view of the action, suggesting it's unnecessary and overly meticulous. 
He's always splitting hairs over the rules, and it annoys the whole team.