I respect vegans and vegetarians (my wife is one), but don't agree with the lengths they go to in self-denial. We are part of nature tooth and claw. We are animals, not above them. I will eat meat and would accept, in turn, that nature is quite happy to watch me should I give it a chance.
I would not invite a vegan to a meal and accommodate their desires by cooking a separate meal for them, to that which others are happy to eat. I think Buddhism is a better model. Buddhists (monks) are vegetarian, yet they will eat anything that is put in their bowl, a show of gratitude being more important than their personal values.
Do vegans sit well consuming fruits fertilised by insects, or is that a level yet to come? I wonder if they would poison/shoot rats that are eating their winter stores.