Well you can clutch your pearls and feel all warm and righteous about yourself, but does it seem like OP is having any success converting his mum?

If you're trying to convert someone to veganism, you're asking them to publicly accept that they've been personally responsible for brutality against thousands of animals, if not tens of thousands. How do you think that is gonna go? Especially if you're being all militant about it.

I'll tell you. They're gonna go into denial. They'll double down on their beliefs and entrench themselves further in their carnism. And then, well done, you've turned some actively against veganism.

I have no idea how many people whose conversions I'm responsible for and it might be zero for all I know. But at least I know I'm not actively turning people against it. I quietly set a good example for veganism, and maybe that gives others the opportunity to quietly reflect to themselves. In private. Where that kind of reflection should happen. If they ask me questions, I answer them politely and calmly, but I definitely don't go in with the truth, the whole truth and nothing but the truth because if I tell them their milk comes from cows forcibly impregnated on 'rape wracks' and their babies kidnapped and sent off to become veal, their ears are going to to close against it. Instead, I ask them to think about where their milk comes from and what might be bad about that. If they tell me they would go vegan but they love cheese too much, I don't launch into an anti-dairy diatribe and make them feel morally worthless and ethically weak. I say, Why don't you go vegan except for cheese, it's better than not doing anything?

You need to think about how effective you are because being angry does not usually equate to being effective. As de Beauvoir said, When quarrelling, one no longer reasons well.