Demanding a rational explanation for why something is considered tacky is a tacky look
by redefining "rational" to include anything originating from human biology, you conflate the origin of a thought with its logical validity
While its true that humans are biological entities influenced by emotion, "rationality" refers to a specific process of evaluating claims based on logic and evidence. to claim that feelings are "exactly as rational" as ideas simply because they share a common source in the brain is a category error. it’s like arguing that a car's exhaust is "exactly as functional" as its engine because both are composed of the same metal.