This isn't about being smug or not. Veganism is morally superior as long as you consider that animals suffer for Human Consumption, envionmental impacts of animal products far outweigh vegan alternatives, and humans can get all of their nutrition from vegan sources.

The reason humans eat meat is for pleasure and profit, neither of which can be considered "morally superior" to the benefits of Veganism.

They're better than you and it should be known.