A person who tends to divide things into two opposed categories or who studies and practices dichotomy.
From 'dichotomy' plus the suffix '-ist' (one who practices or advocates). The Greek root 'dichotomia' combined with the agent noun suffix creates a term for someone who specializes in binary thinking.
Philosophers have debated whether the universe is fundamentally dichotomous (mind vs. body, good vs. evil) or whether dichotomists are simply forcing complexity into false binaries.
Complete word intelligence in one call. Free tier — 50 lookups/day.