斤斤计较

zhè jiù tài jīn jīn jì jiào le

这就太斤斤计较了。

This is just splitting hairs.

bù zhí dé wèi zhè yàng de xiǎo shù mù jīn jīn jì jiào

不值得为这样的小数目斤斤计较。

It isn't worth quibbling over such a small amount.

yǔ qí nǐ gù zuò chéng shú de jīn jīn jì jiào bù rú wǒ jiǎ zhuāng yòu zhì de méi xīn méi fèi

与其你故作成熟地斤斤计较，不如我假装幼稚地没心没肺。

It is better to pretend to be maturity and haggle over every ounce of you than to pretend naive and heartless of me.