making fun of vegetarians were the push they needed to go vegan

There are all kinds of different people, so I 100% agree theses cases exist. But be assured there are also cases where vegetarians feel bullied by both sides. The omnivores mock them for skipping the good stuff and the vegans for not going full blown.

At least in my experience, it's more effective and motivating to praise people for their efforts and progress than to blame them for what's still bad.