That's not very nice.

It's both clever and a dilemma which teaches a relevant point; it may not be nice, but that doesn't matter.

This is the first time I heard about this conversation occurring on IRC.

Does it matter that it was IRC as opposed to a separate forum website? If it does matter, then perhaps you were jumping to conclusions in interpreting 'off-site'...

You aren't always the intended audience. Criticism from the perspective of those unfamiliar with Yudkwosky's arguments are needed.

Sure. But that's by definition criticism I am unable to give and an audience I am not in. Am I to be blamed for preferring the material I learn more from?