These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Values Dissonance: To modern environmentalists, some of the concepts promoted by the book can seem strange or extreme.
Ecotopians are depicted as not only eating meat, but hunting for it. Today, vegetarianism is de rigeur within the environmental movement, and hunting is, at best, frowned upon (and if it's sport hunting, you can expect a lot more than frowning).
There's also "Soul City," a collective term for Ecotopia's ghettoes, where most of the black people voluntarily segregated themselves and which are treated as independent nations. This was based on Black Power ideas that were still prevalent at the time the book was written.