Synonyms of split hairs
cavilIf you say that someone cavils at something, you mean that they make criticisms of it that you think are unimportant or unnecessary.
• This is not the time to cavil about petty details.
find faultobjectcomplainbeef (slang)carpquibblekvetch (US, slang)hypercriticizenit-pick (informal)
quibbleWhen people quibble over a small matter, they argue about it even though it is not important.
• Let's not quibble.
Thesaurus for split hairs from the Collins English Thesaurus
If you say that someone is splitting hairs , you mean that they are making unnecessary distinctions between things when the differences between them are so small they are not important .