Suspicion of impropriety heightens concern, probably due to self-preservation instincts. Someone you don't trust implicitly is more likely to seem suspicious to you if there's a claim of impropriety that can't immediately be explained away by any other currently-available information. When you do implicitly trust someone, much less concern is attributed, even without additional information. This applies uniformly without regard to gender - unless the person viewing the claim is biased towards a particular gender, such as misogynists and misandrists.

It was upvoted because it's weird, there's no simple explanation, and people are concerned.