'cist' berarti tempat, wadah, ruang
'class-cist' secara harafiah berarti tempat/ruang kelas dan secara istilah berarti memerlukan/membutuhkan kelas atau mempersyaratkan pendidikan/penyuluhan dilakukan di dalam kelas.

Dalam konteks kalimat yang disediakan, dimaksudkan penyuluhan mengenai ERB yang perlu dilakukan di dalam kelas.

They offer powerful ideas that can help environmental activists and educators, community leaders, policymakers, and psychologists tackle the criticisms that ERBs are pointless, inconvenient, expensive, time consuming, class-cist. They underscore the importance of several prerequisites to ERB: that local ordinances support them; that people understand which ERBs are preferred and are supported in gaining the knowledge and skills to execute them; and that organizations seeking to implement ERB take motivations and constraints into consideration when creating their messages, particularly concerning ERBs and self-image.

http://www.leapfrogco.com/writingsamps/gap.doc

based on below def:
prejudice against people who belong to a particular social class.
Oxford