This issue is complex and I don't have great overall answers. It isn't clear how search results should bias based on sentiment. (That's discussed on the blog and here.) One thing I am sure of is that I respect discovering a result they consider bad and looking at the algorithms that caused the result and I don't respect deciding that you got egg on your face for the results of your algorithm in this case and jiggering the results.
Of course, we don't know that Bing didn't come up with algorithmic improvements, but the comment you're replying to isn't refuted in any way by the fact that the result has disappeared (or greatly diminished) in Bing. To the contrary, in addition to my bias to agree with the OP on Google / Bing, when one company says, "We've taken a look, made small improvements already that have some impact, and we're looking to make more" and the search result simply disappears in the other case, I'm inclined to take that as specific evidence of the former doing the better job.