Donald Watson invented veganism. Six years later he was driven out of the Vegan Society he founded -- for being the wrong kind of vegan.
The term veganism was coined in 1944, and it was started for reasons of animal compassion, with health as a strong second. In addition to eating a vegan diet, vegans were always encouraged to try to avoid all animal products like for clothing, etc., but it was left to the vegan to decide how far they could go. But people calling themself vegan have always wished to try to minimize animal products for clothing and other products, etc, not just for food, just like ethical vegetarians had done in England for a hundred years before veganism. If you simply eat a vegan diet, you are vegan according to the original definition from Watson. Animal rights activists took over the Vegan Society six years after Watson invented the word, kicked him out for not being a proper vegan, and turned it into a strident, angry, judgmental animal rights organization, and drove most of the members away as a result, nearly bankrupting the org. The history of the org since then has been infighting and even fist fights because the animal rights people have no idea how to sell veganism to the greater world, and so the vegan society is largely a failure and many people view vegans as judgmental holier-than-thou ineffective a-holes -- an unfortunately largely accurate view - just ask PewDiePie. BUT -- you can choose to be a Watson Vegan and be accepting and friendly to others, non-judgmental and encouraging, in other words be a nice person and take your ego out and live an example that inspires rather than lectures other. If not eating animals solves 90% of the problem of animal exploitation, that was enough for Watson to consider you a vegan doing good in the world.