The most damning things about Gwen are stuff that was published when she was alive but which has been totally forgotten. Like in Issue #91-92, Gwen Stacy volunteered for Sam Bullitt because she subscribed to his "law and order" campaign solely so he would hunt down Spider-Man. Sam Bullitt in that issue is an authoritarian racist white supremacist who both Robbie Robertson and Peter compare to Hitler. I mean Gwen Stacy flirted with white supremacy in-page in the Lee-Romita era. That stuff is canon as they come.
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Then in Issue #108 or so, she basically tells Aunt May in so many words to f--k off and stop crying so much about Peter, you know the most sefless person in Peter's life, who took him in as her own son even if they weren't direct blood relatives and who continues looking after him even when Ben dies...
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You don't need to cite bad stories like Sins' Past. Gwen was phenomenally unpopular when she was alive. Read up letters published in that time. Basically stuff like Spider-Man Blue and others manufactured a version of Gwen that didn't really exist.
I never imagined you could actually kill Gwen. You have more intelligence then I gave you credit for. I fervently hope Gwen doesn't make a miraculous recovery in #122 (or in any subsequent issues). I also hope Peter doesn't mourn her too long...how long can he grieve over a person whose brain was constructed entirely out of old Pepsi bottles and whose personality had the exact color, consistency, and flavor of a loaf of Wonder Bread?
— Jane C. Hollingsworth, Letter to the Editor, "The Spider's Web" Column, published in Amazing Spider-Man, #125, a more or less accurate summation of Gwen's reputation before her death, among general readers, and female readers in particular.
Gwen's Stacy death made her the holy version...this ideal woman for Peter...People who say that weren't around for the whole run. They've forgotten how nasty she was. She wasn't the most stable. She'd be all lovey-dovey one moment, and then hands-off the next. She was very strange. Just prior to her death, there was a long period when they were on the outs.
— Roger Stern Spider-Man Crawlspace Episode 37: Roger Stern Interview Pt. 2', Timestamp: 52:00 — 55:00