The philosophy, practice, or tendency toward caustic speech or behavior; sharp, biting criticism as a deliberate rhetorical approach.
From caustic plus the suffix -ism, which forms nouns describing systems of thought or practice. This is a constructed term from philosophical and rhetorical writing to describe a particular communicative style as ideology.
Causticism isn't really a 'real' word in the sense that no one organized it as a movement, but philosophers and critics sometimes use it to describe a rhetorical stance that privileges cutting wit over politeness—it's worth looking for because it reveals when scholars invent terms to name unspoken value systems.
Complete word intelligence in one call. Free tier — 50 lookups/day.