I want to be able to laugh it off.

我多么希望自己能够一笑而过。

But I just laugh it off.

我只是一笑置之。

Laugh it off or make a joke about it.

用大笑来摆脱或就势开个玩笑。

People hear that and dismiss it or laugh it off.

人们听到后，往往一笑而过。

Please, this is important, don't laugh it off.

请注意，这点很重要，不要一笑了之。