Possible, but this seems the simplest explanation to explain the discrepancy.

Regardless of what the explanation is; I'm merely remarking upon the asymmetry and the fact that many persons seem to not perceive the unnatural, amber-colored emoji as neutral territory, but I don't believe this ia a universal human trait either.

I often encounter that various cognitive defects are suggested to be universal in the literature and research that investigates them, and notes it exists, but the research's methodology can often not discriminate between that, because there is no possible negative effect. — it's entirely possible that only half of persons has the asymmetric perception, but that's enough to create an average positive measurable effect.