他是跟你开玩笑呢。你别当真。

He is joking. Don't take it seriously.

《新英汉大辞典》

他是跟你闹着玩儿的，你别当真。

He was joking. Don't take it seriously.

《新英汉大辞典》

别人说你一生将好运不断时，你可别当真。

When others say that you will be constantly showered with good fortunes, dont take it seriously.

youdao

Well they won't be, If you put Alpha and you're paired with Beta, then you will get an A and your pair a C.

纯属娱乐,大家别当真,如果你选α而你对手选β,那么你得A你对手得C

耶鲁公开课 - 博弈论课程节选