Not an index, but a Trope Trope: When a trope is either so played out, so stupid, or so racist/sexist/whatever, that seeing it makes some portion of the audience go berserk.
Part of the death cycle for a trope; any trope that qualifies is already at least close to becoming a Discredited Trope.
Note that subversions and deconstructions are probably already playing too close to the line, and playing them with even a hint that they're being played straight will get certain people up in arms.
See also Tropes Are Tools. Contrast Favorite Trope. Often overlaps with Opinion Myopia and Bias Steamroller- it is frequently baffling to a person that anyone could possibly like their pet peeve trope, and seeing a pet peeve trope in a work can be grounds for pulling the Ruined FOREVER alarm. Read Trigger Warnings to understand how to warn audiences of pet peeve tropes and how to utilize them effectively in writing.
No examples, please. This article defines the term.