Try this
- Name the topic and the behavior you want stopped, using one recent example if helpful.
- Ask for the change directly. Do not broaden the request into a ban on every kind of humor unless that is actually your preference.
A worked example
“Please leave my work situation out of our teasing.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Focus on the requested change rather than proving whether the earlier joke was intended kindly.