nitpicker

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nitpicker

Someone who is overly inclined to point out or complain about every flaw they come across (in or about something), no matter how small, petty, or insignificant. Sometimes hyphenated or spelled as two separate words. You might write me off as just a nitpicker, but you'll appreciate it when you get an A+ on this paper. This is why I hate going to the movies with nit-pickers like you. Instead of just enjoying what we watch, you have to criticize every little flaw you can think of!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

nit-picker

n. a person who is hypercritical. Mary is such a nit-picker!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.

nitpicker

Someone who bothers with tiny, trivial, unimportant details, in effect looking for mistakes. “Nit” alludes to the tiny eggs of the louse. The term dates from the mid-1900s.
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in periodicals archive ?
They even nitpicked clients during lunch hour at Fields' kitchen table.
"There are inevitably a few small points that will concern Leave campaigners but we must all recognise that everyone will have to give up something to get a deal, so now is not the time to nitpick," he said.
But something that you won't need us to nitpick is the pay-to-win aspect.
SHERLOCK As we all recover from the cataclysmic 50th anniversary episode, BBC Wales are at it again teasing the new series of Sherlock KANYE WEST The man with the Messiah complex had the music world laughing its collective head off with his ridiculously overblown live shows HOW I MET YOUR MOTHER Now I'm not one to nitpick but just when are they going to notify those poor kids just how their old man met their mother AMY CHILDS Apparently the cushion-lipped, tangoed 'star' could be heading back to The Only Way Is Essex.
But this was a fantastic occasion and it was churlish to nitpick.
If you have a brand-new home, the cosmetic items should be as close to perfect as possible, so don't be afraid to nitpick.
I'm hoping that I'm not the only one who has written in to nitpick about this omission--I think that Ariel Schrag is truly revolutionary in the world of comics, and I doubt that I'm alone in that thought.
So with plenty of events to choose from, guests feel it's their duty to nitpick over such things as the paltry servings of shrimp and steak on a skewer.