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They're botching an old joke by trying to hammer it into your bit about schnitzel.

The old joke: "How do you spot the vegan in the crowd?" "Don't worry, they'll tell you." It's a commentary about how vegans will insert themselves into every conversation, on any topic, and somehow make it about veganism. (You know. Like what just happened, just very incompetently.)

It seems @[email protected] is a vegan, if this post of theirs has any meaning, so they're trying, rather incompetently, to flip the joke on its head and say that no it's actually the people who eat normally that somehow have this behaviour (even though it makes no sense on the face of it).