i don't think it's an issue that should be brushed off, personally. veganism doesn't merely encompass personal dietary habits. we're all responsible of some degree of harm to animals and the environment (which is where animals, you know, live) and i think we should at least own up to it rather than dismiss it, especially in the presence of an omni. if we're going to deny personal responsibility for contributing to the devastation of animals and their habitats, why shouldn't they? the emphasis should definitely be on reduction of harm as opposed to the purity of personal actions, but perhaps we should all be striving for the latter and recognizing that we have and may never reach it.