Increased meat consumption did increase our evolutionary development. It also did so at a cost both physically ( charred Imperial Mammoth increases carcigons) and the oldest
pan human measure of wealth; cattle are impacting the global climate with methane levels, water use ( it takes more gallons to produce one pound of hamburger than saved in an entire year for sea showers) and deforestation for grazing. Commercial farming is not without impact either; chemical use ( insecticide, herbicide and fertiliser) causing bee colony collapse disorder from nicotoids and ocean dead zones from nitrogen fertilizer runnoff. The impact of frankenfood GMOs, patenting seeds used by local culures for millenia and charging them while heirloom varietals go extinct along with domesticated animal species from monoculture farming and animal factory farming. The new gold rush to control dwindling water resources predicted to begin failing demand in under 20 years has witnessed gross human rights abuses.
Few people, no matter how well intended on ethical or dietary grounds fullly comprehend our individual impacts. I eat meat; exclusively american bison and the smaller sardine and herring fish species able to reproduce faster than our alpha apex tuna, salmon and swordfish. I eat organic produce- when needed. Some items; ie Kiwis are not subjected to chemical treatment and avocados have these really thick skins. There is just as much marketting dishonesty by the 'organic community'.
Instead of resentment or in your face consumerism toward anyone with dietary beliefs EDUCATION is the solution.