The fox invited the rabbit to drink beer. How does the rabbit's ass hurt after drinking beer?

There is a similar story. A joke many years ago. It was in a bar that a man bought another man a drink (I don't know him) and drank whiskey. The latter drank too much and found his ass hurt the next day. I don't know what happened. In the evening, he went to the bar again, and the man bought him whiskey. He drank too much and woke up in the morning to find his ass hurt. Two days later, he went to the bar again. The man said he wanted whiskey, but he said no! My ass hurts the next day after drinking whiskey. The man who bought him a drink was gay. ]