It's rare, but occasionally there's a story that so offends the comic-reading community that it collectively decides to completely ignore that story.
The classic example is the Silver Age issue of The Flash where a character named Mopee announces that he caused Barry Allen to gain his super-speed powers. It was silly, absurd, and everyone quickly decided that "It Never Happened." Mopee was never mentioned again, except in the pages of Ambush Bug.
It happened again years later when they decided to explain why no one notices that Superman and Clark Kent look exactly alike. The explanation was that Clark was unconsciously using super-hypnotism to make everyone see him as frail and timid. Again, the story was immediately ignored and never mentioned again.
The Amazing Spider-Man has been dealing with some of that, as Mephisto wiped out everyone's memory of Spidey's secret identity at the same time he did away with the marriage of Pete and Mary Jane.
Because the event has had a lasting impact on the character, fandom can't ignore it - although many of us wish we could. To add to the problem, continuity glitches keep popping up, and writers feel obliged to explain them away, even though doing so just annoys the readers.
For example, apparently Pete knows that his identity was revealed to the public - and now is a secret again. He explains it as a kind of mind wipe - but how did it happen? Does he remember Mephisto doing this? What about Mary Jane? Or is there another explanation?
This issue wraps up a two-issue team-up with the Fantastic Four, and Pete's explanation (or non-explanation) to Mr. Fantastic borders on the incomprehensible.
They'd have been much better off to just leave us with "no one knows who Spidey is." The more they try to explain it, the muddier the continuity waters get.
It's like the old line, "We can't miss you if you won't go away." The sooner they stop dredging this up and trying to explain every detail, the sooner fandom can get back to enjoying Spider-Man's adventures. Hopefully.