I think I know what a joke looks like. Many of my responses attempt humor. Also, I constantly tell people about the great taste of Chef Dong's Chicken, so fresh, u taste meow. Me Chincnese, not round eye. Sarcasm is much more easily conveyed with tone of voice or other clues. Pure text is more ambiguous. I confess, I was puzzled and did ask, as the multiple question marks conveyed. I would've assigned more probability to it being sacrasm, if I'd seen any humor, but I didn't perceive any.