From what I have seen, it more stems from the activism vegans are engaged in more than the actual veganism.

That entirely depends on the client. Some doesn’t even have notifications. So I would look for a different client, a good list available here.

On lemmy-ui (official client) other than ignoring them, there isn’t. Lemmy is built around engagement instead of voting, so it’s kind of integral feature.

https://federation-checker.vercel.app/