If you really want to start a vegan war sometime, call someone a welfarist. "Welfarist" is the term that the animal abolitionist people use to describe people like me who think that, while it would be great if everyone would stop eating meat, that's not going to happen any time soon, and passing laws banning gestation crates or mandating a certain amount of land per animal on a farm and other things like that are useful and good things to work on in the meantime. They use the same word to describe someone who goes hunting on weekends, has a pet dog, and sends a check for $20 to the ASPCA every once in a while. They'd say that laws about the treatment of farm animals that still allow those animals to be killed just let omnivores think, "Well, it's OK to eat that meat, because it comes from a happy cow," and that advocating those sort of measures is ultimately counterproductive.
Also, although it's not an "official" part of veganism, a lot of vegans will try to buy organic produce and produce from smaller farms as much as possible, and one of the reasons is that the larger farms are often pretty sketchy with following labor laws and the farm workers at non-organic farms are often exposed to dangerous levels of pesticides. With the way our food system is structured, where you can buy a jar of spaghetti sauce that might have ingredients grown in seven different countries, trying to have a diet free of human exploitation is actually much more difficult than trying to have a diet free of animal exploitation, since, unless you're a locavore, it's nearly impossible to actually find out about the conditions of the workers who grew and processed everything you're eating.