The accomplishment I'm referring to is creating GPT/DALL-E. Yes, it's overhyped, unreliable, arguably unethical and probably financially unsustainable, but when I do my best to ignore the narratives and drama surrounding it and just try out the damn thing for myself I find that I'm still impressed with it as a technical feat. At the very, very least I think it's a plausible competitor to google translate for the languages I've tried, and I have to admit I've found it to be actually useful when writing regular expressions and a few other minor programming tasks.
In all my years of sneering at Yud and his minions I didn't think their fascination with AI would amount to anything more than verbose blogposts and self-published research papers. I simply did not expect that the rationalists would build an actual, usable AI instead of merely talking about hypothetical AIs and pocketing the donor money, and it is in this context that I say I underestimated the enemy.
With regards to "mocking the promptfans and calling them names": I do think that ridicule can be a powerful weapon, but I don't think it will work well if we overestimate the actual shortcomings of the technology. And frankly sneerclub as it exists today is more about entertainment than actually serving as a counter to the rationalist movement.