Zen or stoic?

I heard a woman on the radio mention that she was just "zen" about something bad that happened. I've seen it used that way online, too, and seen it on television.

Meanwhile, I can't remember the last time I heard someone say that s/he was "stoic" about something bad that happened.

I find myself wondering if people now use "zen" when they mean "stoic", and if these people even know what the term "stoic" means.

I start to wonder whether I ever knew what these words meant.