I use a very similar one to that, Exec.
Omni: "You don't eat meat?"
Me: "You eat dead animal carcasses?"
Also, when serving omnis, say when distributing the contents of a communal picnic basket or a bag of take out (away), I always try to use the literal terms for what people are eating:
"Who ordered the ground cow muscle? scrambled bird menstruation? side of cow secretion fat? insect vomit?" etc. [hamburger, egg, butter, honey]
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