What does the term batting a thousand mean when you say it to person having bad day?

"Batting a thousand" generally refers to achieving perfect success or an extremely high rate of success at a task. However, when you say it to a person having a bad day, the term is used ironically or sarcastically to emphasize the person's lack of success or misfortune. In this context, it highlights the humorous contrast between the usual meaning of the phrase and the person's current situation. It's a light-hearted way of poking fun at their bad luck or difficulties as an attempt to cheer them up.