[Aerkuld]

Alright. I sort-of understand the vegan's perspective. You're buying a meat-free burger out of principle.
BUT you're in f-in Burger King! If you're really worried about contamination don't you think it should be on you to check whether it's cooked on the same grill BEFORE you eat it? I mean, they're not advertising that it's suitable for vegans, only that it's a plant-based burger. Does it really matter anyway? Sure, avoid meat products for your conscience, but (again) you're in BURGER KING. What? You mean they've had meat products in the same building! I really don't see what damage has been done that couldn't be put right with "Oh. I'm sorry" and maybe refund the cost of the meal.
Bringing back dueling should resolve these stupid claims. Accept an apology face-to-face, or swords at dawn 'till first blood. Should be popular with vegans.

For the record, I actually like the 'Impossible' burgers. There was a restaurant here which did a blackened, pepper crusted impossible burger with blue cheese and blueberry dressing and it was delicious. Compared to the beef version, the impossible version seemed to have more flavor. Since the big chains have adopted the impossible burger, the small guys can't get them in sufficient quantity anymore.