I do not agree with veganism as a moral standard. If it is your personal moral stance, that is fine. If you think humans eating meat is inherently immoral, I don’t want to deal with you, you’re hopeless. Vegan ideology behaves more like a sect of evangelical Christianity than a dietary choice.

Veganism is better for the environment, but claiming that it's a morally superior choice ignores cultural and economic factors that make people eat animal products.

It is not inherently better for the environment. That is the thing. When you begin trying to explain that local, sustainably sourced animal protein is better for the environment than imported plant proteins that are farmed 3,500 miles away using slave labor, they start tuning you out. Down is better for the environment than polyester stuffing, leather is better for the environment than pleather. We should work on making animal agricultural practices more sustainable instead of trying to shame everyone into eating plant products that are also farmed unethically and unsustainably.