This week, top execs at Dell, HP, and Microsoft took turns bashing the Apple iPad. Dell said it was doomed to fail in the enterprise world; HP said its channel partners couldn’t stand Apple’s arrogance; Microsoft called tablets a “fad.”

Microsoft also took another shot at Apple’s increasingly unpopular attempt to trademark the phrase “app store.” Eric Goldman, an intellectual property lawyer, told me Apple’s case was weak and suggested the company divert all the money spent on its lawyers to re-establishing goodwill among its disgusted consumers.

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It’s one thing for Apple’s rivals to bash Apple, that comes with the job, but it’s another thing entirely when the trashtalk derives from Apple’s own consumers.

This week on Twitter, we came across some pretty angry sentiments from Apple fans. Many originated from outside the U.S., which makes sense given that Apple apparently sold out of iPad 2s a day after launching overseas (and domestically, analysts estimate Apple sold around half a million tablets during launch weekend). Others came from recent iPad 2 owners who dissatisfied with their new tablet.

In the run-up to the iPad 2′s launch earlier this month, many in the tech community professed their love and anticipation over Apple’s “magic” and “genius” and guidance into a “post-PC” world. We gave it an Editor’s Choice award. We concluded you should get one. And based on the lines wrapping around Apple Stores that Friday, it looks like many of you did.

But this week, the gloves came off. Coincidence, or did we miss the memo about Apple Trashtalk Week?