A few notes:
Moral relativism and metaethics in general is unrelated to the scientific method, I hope you can figure out why and maybe discuss it the next time.
You appear to make a sharp division between you (the enLWightened) and "them" (the unwashed). Given that "the need to detect [the biases] in ourselves", how much effort and time have you put into describing your own experiences?
Given the apparent failure of this last class, can you identify your personal bias or a fallacy which resulted in you being blindsided by this failure?
Consider starting small, with short, clear and engaging examples, like the Newcomb's problem, the PD or the Trolley problem, or the Milgram or Stanford experiments
A common problem of novice instructors is to cram a lot more material in one class than the students can conceivably absorb. This is because we tend to underestimate how hard something is to learn after we internalized it. After all, it looks so clear now! Consider reducing the amount of material you plan to present and go over more examples instead.
If you know your audience well, consider modeling their reactions to what you say, given their level of understanding, interest and skepticism, then plan for contingencies, like how to get a sidelined discussion back on track without being heavy-handed.
Good luck!
A common problem of novice instructors is to cram a lot more material in one class than the students can conceivably absorb.
I haven't noticed that that's any less common among non-novice instructors.
I'm afraid I haven't properly designed the Muggles Studies course I introduced at my local Harry Potter fan club. Last Sunday we finally had our second class (after wasted months of insistence and delays), and I introduced some very basic descriptions of common biases, while of course emphasizing the need to detect them in ourselves before trying to detect them in other people. At some point, which I didn't completely notice, the discussion changed from an explanation of the attribution bias into a series of multicultural examples in favor of moral relativity. I honestly don't know how that happened, but as more and more attendants voiced their comments, I started to fear someone would irreversibly damage the lessons I was trying to teach. They basically stopped short of calling the scientific method a cultural construct, at which point I'm sure I would have snapped. I don't know what to make of this. Some part of me tries to encourage me and make me put more effort into showing these people the need for more reductionism in their worldview, but another part of me just wants to give them up as hopeless postmodernists. What should I do?