b) DS is not a vegetarian, because she is willing to eat meat that is free-range, organic and locally-sourced; and
c) . And in her mind, your sister is not a vegetarian anyway, just picky about where her food is sourced from, so why can't DS just let it go for once?
'It's not as if meat makes me gag. It's one meal. I'll try and get a free-range etc. turkey. If I can't, I'll just eat whatever darn turkey she gets.
I have considered myself a vegetarian since 1998, due to meat inspection lectures, cruelty, the way we grow and handle meat. I did not enjoy it anymore so I quit eating it. DH is a very good and ethical hunter, once I met him I started occasionally eating venison and other wild game. I guess that makes me a flexi-whatever, altho I won't eat any meat that I do not know exactly where it came from (not organic, etc.)
I would NOT enjoy eating turkey and I think the comments of "let it go for once" "its one meal" "and if it doesn't make you gag" are very dismissive of a person's food choices. I know that is not how it was meant, but replace turkey with alcohol and read it again. Would you expect someone who doesn't drink to consume alcohol because it is a holiday, only one meal, you sip wine in church, etc?