nǐ / zěn me / zhè me / bù shí hǎo dǎi / rén jiā / tè yì / lái / bāng / nǐ / nǐ / hái / fā pí qì

你怎么这么不识好歹，人家特意来帮你，你还发脾气。

How can you be so undiscriminating? Someone came specifically to help you, and you still lose your temper.