What is a sentence for churlish?

The store manager instructed all the salesclerks to avoid churlish replies to customers' questions.

or

You hurt her feelings when you reacted to her comments in such a churlish way, especially since you asked for her advice.

or

The assembly speaker may have been boring, but that was no excuse for the students' churlish behavior toward him.

or

The students behavior toward the teacher was unacceptable.