the fundamental error you are making is thinking that ethical concerns will ever dominate material and cultural factors (which "ethics" are a subset of). the base (material conditions) and superstructure are the real forces reinforcing meat consumption.

the only advantage the working class has is numbers, yet your priority is to immediately subdivide them into "good" and "bad" categories— instead of using those numbers to seize the power that could then reduce those material and cultural factors that reinforce meat consumption. that's why I keep mentioning a dictatorship of the proletariat, the only way to actually achieve communism against the forces of capital reaction. less sorting the working class on moral grounds, more historical materialism.