Just make a normal meal for everyone, just before you serve them, pick the meat off the vegetarian's plates and put it on your own. 😉
The OP's quote sounds crazy though. They must really love cooking for all those different people otherwise I don't think they'd do it.
It's not hard really, is it, for the veggies to let the carnivores eat meat without derision, and for the meat-eaters to let the veggies enjoy a meal that's not covered in dead flesh?
All the veggies I know are completely un-militant about it and enjoy a bit of teasing as much as the next person, I don't think it bothers them to be honest.