I have actually no idea what you want to say with “generative AI vegetarian.” You mean people who refuse using LLM's?

edit, I see, a new slang:

https://news.ycombinator.com/item?id=47928885

Probably another viral marketing campaign to further pressure those meta employees to have their in office flatulence levels monitored with probes as they are pressured to vibe code more features faster.