Is this Mango or Papaya?

This past weekend, I went to Whole Foods for my usual organic produce shopping. This Goth cashier greets me with a smile, picks up my mango and goes, "I can't tell, is this a Mango or a Papaya?" I told her what it was. With a smile. I've got a very superficial understanding of the Goth culture, but I wondered if they don't know what it was because they won't eat tropical fruit? You know, how the Vegans won't eat dairy or the way my kid won't eat anything savory after 8pm?