If I tell you we’re going to the football game and you’re excited for that and then I take you to the ballet instead, it’s still wrong! It’s lying!

Football enthusiasts are generally not morally opposed to ballet. This is not a good metaphor. Imagine instead that you're opposed to the death penalty, and I tell you that we're going to the ballet, but it's actually a public execution. I desperately hope that you can understand that that's worse than the reverse situation.

No, I'm just looking at it realistically instead of dumbing it down to a kindergarten reading level. "Lying bad" is such a numbskull take. Obviously it's better to be honest about the food you're serving people, but different lies are different amounts of bad. I shouldn't even have to explain this. If you feed me a seemingly mushroom-based dish, then reveal that it was actually made with tofu, that's not good. For all you know, I'm allergic to soy. If you instead tell me that that dish actually had veal in it, that would be worse.

On top of not knowing about any potential allergies, there's an extra layer of moral opposition. I'm not giving vegans some special pass here, that was the point of the cannibalism example. You feeding a cannibalistic friend beef under the pretense that it's human meat isn't a good thing, but it's not as bad as your cannibalistic friend feeding you long pig under the pretense that it's pork.