I am just taking a wild guess here, may be the vegan dish suck?
Being a vegetarian I really don't know how to respond when someone is being considerate and ordered me a plain rice with stream veggie while everyone else are eating fish and lobster.
Vegetarian meal is hard to cook due to limitation on ingredients, I can't imagine how much harder it would be for vegans. You can't just take a meat recipe and substitution the meat with mushroom.
Next time when you prepare vegan option, ask yourself this, "can I eat just this for dinner?" If the answer is "no" for you then it would be the same for a vegan, we have taste buds too you know.