"Sana tigilan mo na ang pagbibiro at pangungulit sa akin."

Explanation:

In this situation, you should directly and briefly communicate your feelings to your classmate. You can say something like:

"Hey, I don't appreciate the teasing and joking. It bothers me, so please stop."

This straightforward approach clearly expresses your dislike for their behavior and sets a boundary. It is important to be assertive and firm in your communication while maintaining a respectful tone.