Talking about veganism where it is hard to hold them accountable

I asked a bystander, "Would you give up pizza to stop rape, and why so?" to which she answered "Being a girl, I would". Here is how the conversation went.

It wasn't the best of the conversations I have had. I failed to hold them accountable for many things, argued about petty points, missed out on many points I could have capitalised. However, here it is.