How do I ask a friend to stop joking about me being fired?

I have a friend who is not very perceptive sometimes and brings up something that happened a few months ago.

long story short I was fired from a job (still not sure about the reason tbh) and i shared it with a friend for comfort. Most people i told did not use the word “fired” for more than once or switched it to “let go”.

But this one friend keeps highlighting it casually, saying stuff like even if we try hard at work “we get fired” (but obviously this is in reference to me) or say “they fired you, your experience was worse than mine.”

i told her she sounded way too comfortable saying that and asked if she shared this info with others and she said no, it is my business only and she meant they blindsided me.

it is frustrating, how do i tell her to stop without sounding annoyed?

How do I ask a friend to stop joking about me being fired?
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