Veganism shouldn't be written off, but it's quite easy to find arguments which frustrate the clear-cut message that they hope to deliver, which is that folks should never eat animals but that folks should nonetheless eat something. My typical approach to vegan arguments is to introduce them to Jainism and have them compare and contrast their values and practices.
The idea that vegans are wealthy and white is simply false. Around the world it tends to be the poorest people who do not eat meat, and in the US most vegans are low income and more likely to be racialized peoples.
Do you have a reference for the incidence rates of those side-effects?
It'd be useful to compare and contrast those against the risks of food poisoning from undercooked and contaminated animal products, and the sense of having supported and received food from potentially unsanitary animal product preparation centres.
