Game concept
Detractor
The game also links it as Detractors.
From the game's encyclopedia
Detractors are Guests at the Coronation Activity opposing the Host in their ascension to the throne. They will attempt to foil the Ruler and ruin their Legitimacy.
They are directly opposed to the Supporters, guests who are attempting to aid the host.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Detractor is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Detractors are Guests at the Coronation Activity opposing the Host in their ascension to the throne." It is part of Coronation. The game also links it as Detractors. Patch 1.20.1.2, from game/common/game_concepts/ach_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/ach_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.