I don't see any inconsistency. Your hardware is less power efficient at both tasks -- whether that be computing polygons for gaming or computing SHA256 hashes for bitcoins. Both are very much using the hardware for a non-productive, entertaining purpose and both are non-green activities.
Anyone raging at you for being non-power efficient in the first place would still be justified in rage had you actually tried to bitcoin mine for the same reason. Radeons are still way 'greener' at both tasks, that has not changed.
Now, had the issue been about gaming AT ALL in the first place then the rager would have been quite the hypocrite had they now dogpiled on the bitcoin bandwageon.
To give you context, notty is apparently referring to a discussion on these boards several months ago re: the GTX 460-1GB vs. the HD6850, where I noted that the peak power draw was higher for the GTX 460 and that idle was either a draw, or possibly in favor of the HD6850 according to a few reviews, but it was hard to say for sure. I noted that most people don't game more than a few hours a day, so if they leave their PCs on 24/7, then idle power draw is what really costs you in the long run. In a typical case, the differential could be ~$15 per year, which could be enough to tip the balance of which card had better bang-for-the-buck in the long run, since $15 is a significant fraction of the then-going rate for the cards (which was about $160 at the time, if memory serves). In any case, I said that you can't go wrong with either card at that price point. I also didn't raise a big fuss about environmentalism, knowing that most gamers--most people in generally, really--don't care.
Certain people flamed me for saying that, mocking my power analysis and saying hey, what's a few bucks in the grand scheme of things? Some also noted that when both were overclocked, the GTX 460 could arguably eke out a small advantage in frames per second over the HD6850. My response was this:
1) if a few bucks doesn't matter in the grand scheme of things, then an extra frame per second here and there also doesn't matter in the grand scheme of things;
2) if we're serious about comparing bang4buck between two cards that basically tied in performance, then we might have to look at tiebreakers (e.g., Eyefinity vs CUDA/PhysX, power draw, noise, thermals) to determine a winner;
3) I said you can't go wrong either way.
I don't know why he's getting personal with me and misremembering what I said in the 460/6850 thread (repeat: I did not go in depth into environmentalism in that thread). In this thread, I just agreed with the other guy who assembled a fairly damning digest of notty's recent comments about BTC mining, except that I expressed doubt that notty actually lost money on BTCs. It doesn't take a "Dr. Phil" to see notty's leanings, as it is self-evident from his many snide remarks against BTC mining and sniffing about how NVDA cards are better at Folding. But hey, green is the color of NV, after all, pardon the pun.