The Daily Show recently did a segment – R.I.P. Facts – lamenting the fact [sic] that what is actually true no longer matters.
The problem, however, is actually significantly worse. If someone believes something false that conforms to their preconceived beliefs, fact checking them can actually strengthen their false belief. This is called the “boomerang effect.”
This is important to recognize, because it is very likely that most people believe that eating meat is necessary; chicken is healthy; free-range means cruelty-free; etc. Just telling them otherwise, even with supporting facts, is likely to just reinforce their current belief.
Instead, it is good to start by seeking out common ground. While most people have a negative view of veganism and vegans, most people also have a visceral repulsion to factory farms. So it is often good to ask what they know about factory farms as the beginning of a Socratic-style discussion.
Also, most people are willing to speculate on the motivations of others (rather than defending their own beliefs). It might seem strange, but asking people if they know anyone who is vegetarian and why they think those vegetarians don’t eat meat can be a good hook.
Unfortunately, there is no set script we can follow in every situation. But it is important to recognize that we can’t actually win an argument with a meat eater. The best we can do is to start a conversation. This is the way we can potentially find common ground, and allow the other individual to open their heart and mind to uncomfortable ideas.