Calling veganism a "lib moment" when it's actually within the logical conclusion of principled leftist tendencies has got to be one of the most painfully obvious copes I've ever seen on this site.
When you understand the vast, vast material impact of continued meat consumption in the imperial core it is very hard to paint veganism as anything other than the correct thing to do. I would not lump it in with liberalism, that’s for sure.
Thankfully, Hexbear has a really comprehensive direct action guide that breaks down the best way to organize and advocate for many specific leftist causes.
You can find the section on veganism if you scroll down on this page a bit.