A sensitive question

I deal with a lot of suic**** tendencies. Well that's how f*cked up my head is. But it's because I feel it's the easiest way out of the pain. I'm battling the thought everyday. Somedays easier while some make it hard for me.

So my question is this actually. How would you deal with a coworker who talks about this at work as a joke. For instance if shit gets hard, she will state she wants to do it. I can sense she's fooling around. She'll be like I'll do it and my husband will suffer with the kids.

But why would a person make jokes on a subject like that?

It's annoying and I get pissed off. Idk why do people consider this a joke in the first place. Is it normal or am I overthinking this?