Sometimes people have different experiences and that means they might find something funny, but someone else doesn’t.
If you feel brave, you can speak up and say that you don’t think it’s funny and you can explain why it hurt you or might be hurtful to someone else.
If it was something hurtful, you can also always talk to a trusted adult about it. Especially if it was at school or at an activity, the adults there must address it so you can be comfortable there.