Broken Base
"The only question I
Ever thought was hard
Is 'Do I like Kirk
Or do I like Picard?"
"Weird Al" Yankovic, "White and Nerdy"

A broken base is a civil war among fans of a particular franchise. Almost every franchise has at least some internal conflict among its fanbase, but a truly broken base is characterized by a sustained and exceptionally vicious conflict between two or more large, vocal, and entrenched factions with little or no middle ground to be found between them.

Common causes of a broken base include shipping wars, a large and vocal Periphery Demographic whose priorities are at odds with the main demographic, or a divisive character, sequel, adaptation, or remake.

Contrast Fandom Heresy for a fandom opinion that is near-unanimous to the point where it tends to silence any dissent.

Unrelated to Broken Pedestal.

Examples go in subpages: