As Paul said, customers don't care. All they are doing is giving Bing some front and center advertising on it's blog (which has several non-tech readers) and the tech people who actually care probably don't enough to actually switch search engines.
Google didn't fire right off the bat with the hard-hitting blog entry, but instead basically gave a more detailed version of the same thing to Danny Sullivan. They wanted to see how Microsoft would react before going official with it, because even though Microsoft's response was predictable, there's always a chance that Microsoft would have surprised everyone with their response. (They didn't, in my opinion.)
What's struck me most about this story as it has developed throughout the day is that Google's actions are very deliberate and planned.
I wouldn't consider Google as continually mentioning Bing, either; in fact, I don't think they've paid much attention at all to them. Put Bing in the search box on their official blog, and you'll see that this is the only post specifically about Bing -- a perusal of older posts indicates that the rest are hitting on comments or TrackBacks (i.e., the background image misfeature).
In this case, I don't know how this discussion (verging on disagreement) could occur without mentioning the competition.