A lot of folks were put off by 4E D&D, and didn't feel that the rules and/or cosmology really spoke to the classic D&D experience. WotC published something they did not care for. Okay.
But WotC did not insult, alienate, or disrespect the fans. WotC made a business, and an artistic, decision that was arguably a bad call. I will never be able to understand the fans who took that as a personal attack, who felt disrespected or alienated. I felt the same way during the edition wars after the 3E launch, as there were similar complaints from "alienated" fans. I just don't get it.
When 4E first came out, I was pretty excited and dove into the new edition. The fresh take on the rules was exciting, and I liked a lot of the changes to create a "tighter" cosmology. But, overtime, the 4E rules soured on me as each class felt to "samey". And while I still dug some of the specific cosmology changes (love the Eladrin/Elf/Drow thing), other changes seemed unnecessary and pulled too far away from that classic experience. Eventually, my "allegiance" moved back to 3.5E, at least until 5E was released, which is my new hotness. Looking back, I do feel that WotC made a mistake pulling 4E too far away from the classic experience in both rules and cosmology and that led to a further fracturing of the fan base.
But at no time did I feel insulting, alienated, disrespected, or anything other than "not served". My only response was to stop purchasing 4E titles and refresh my 3.5E campaign. No stress, no angst, no worry.