People consider vegans on Lemmy as too preachy. Even in vegan communities here, mods have to remove soooo many inappropriate comments (I read a few of these and they keep getting removed for good reasons). Comments that suggest going vegan on posts about animal abuse are downvoted.
At the same time, whenever there is something about Windows or Chromium based browsers, people here are doing exactly the same. “Just use Linux/Firefox/whatever”.
This comment borders on some conservative talking about how they’re “being censored for speaking the truth” after rambling about some conspiracy theory or saying something racist.
The person you responded to is basically saying that anyone who eats meat is a brainwashed moron without any agency. I rarely ever see anyone have such a visceral reaction toward someone who claims to be vegetarian. Why do you think that is?