Chu Shuzhi cracks open a cold one with Ji Xiaobai, so there must be alcohol tolerance! The bar serves booze!

Hmm, maybe the dirt nap gave Shen Wei an ethanol allergy? Or he absorbed the power of being unable to handle booze and can't forget it. Since his brother can handle it but he can't. Crack theory: the Treaty forbids him from drinking alcohol because of a terminology flub, so the dark energy maintaining it makes him fall unconscious after even a drop.