Sansa's wedding night
Season 5, Episode 6: "Unbowed, Unbent, Unbroken"
Between Joffrey, Ser Meryn Trant, the Hound, Littlefinger's nonconsensual kissing, and that mob of peasants during the King's Landing riots, rape has been the Sword of Damocles dangling over Sansa's head since the beginning of the series. But for many, seeing a character they'd met as a child raped on her wedding night summarized everything the show gets wrong with its portrayal of female characters' struggles.
While the plotline has its defenders -- including the episode's writer Bryan Cogman, who views the narrative choice as a showcase for Sansa's strength of character, as "she's not broken by the attack, she immediately sets to getting the hell out of there and planning her next move" -- it was enough for The Mary Sue to completely step out of the Game of Thrones business, calling the episode "a missed opportunity to do something that would have actually surprised [the] audience." Instead, Sansa spent much of the season trapped inside Ramsay's rape tower.