"What I would find patronizing is someone thrusting a painting at me and saying "Say something mathematical!" I think it is equally patronizing to ask an artist to saying something artistic about the Singularity or a poet to say something poetic about math."
It seems to me that the original invitation was for artists to participate in the discussion. To me this isn't absurd at all. No one was asking them (as far as I can tell) to "say something artistic." Rather, there was a recognition that those who self-identify as artists may have a different perspective, whether that perspective itself can be considered "artistic" in its own right or not.
It's not unlike a group of male advertisers sitting around a table considering whether they should solicit a female colleague's perspective on a particular ad campaign. That might be considered condescending, but its equally likely that her opinion may be of value, if not uniquely "feminine" in some way.
Nonetheless, as you suggest, a vague invitation to "participate" won't necessarily generate anything useful.
At the Singularity Summit yesterday, several speakers alleged that we should "reach out" to artists and poets to encourage their participation in the Singularity dialogue. So at the end of one such session, a woman went up to the audience microphone and said:
"I am an artist. I want to participate. What should I do?"
And there was a brief, frozen silence.
I wanted to leap up and say:
And if she'd asked me afterward, my real answer would have been:
But I didn't say any of this, of course. It would have been indecorous.
And while we're on the subject, I would feel rather patronized - like a dog commanded to perform a trick - if someone presented me with a painting and said, "Say something mathematical!"