A quirk, habit, or quality that is not technically a red flag, nor remotely a green flag — it simply exists in an unsettling, unclassifiable beige zone. Beige flags provoke a mild, confused "huh" rather than a decisive yes or no. Examples include: exclusively listening to film scores during workouts, owning more than seven throw pillows arranged by mood, or insisting that tap water tastes "different" in different rooms of their apartment.
Beige flags are not dealbreakers. They are, however, data points that deserve consideration when triangulated against the rest of the evidence.
"He told me he alphabetizes his spice rack but doesn't own a couch. That's not a red flag, it's a beige flag. I need more information."