I can somewhat understand the downvoters in this case. The discussion at hand is "should we accept objectification of women in the tech industry" with opinions ranging from "No, nothing even resembling that" (paraphrased) to "It's not that big a deal"[1]. To those closer to the first stance, we don't want those kinds of opinions to gain traction here, in this community. I've done that by commenting, others by downvoting. Ideally, every comment would get a response, but there are more of these "it's not a big deal" than there are original ideas being expressed. Really, the top comment[2] should be enough to convince you that this was not an OK move on API Jam's part.

[1] http://news.ycombinator.com/item?id=3731608

[2] http://news.ycombinator.com/item?id=3731725