It's possible to recognize the attractive features of someone while still being conscious of their humanity. Obviously there are degrees of attention you can give someone based on their looks that goes from socially acceptable to socially unacceptable.

I'm a man so I can't speak for women directly, but what I've gathered from the experiences of others is that women are interacted with on an attraction basis exponentially more than men are, this also constantly ranging from socially acceptable to unacceptable, wanted and unwanted. It manifests in little ways, cat-calling, aggressive or unwanted flirtation, maybe a creepy controlling coworker suddenly confessing his love? My own mom told me about a time when a total stranger grabbed her butt in a store and walked off. It makes sense to me that many women would be extra-sensitive to scenarios like this. Men literally don't have to deal with interactions like this at that level so it's totally different when the gender roles are reversed, and it's rare that they are.

The importance of that scenario was that it was relative to her entire work experience at Github. Even if we assume the intentions of the male workers were totally golden and the hula-hoopers were totally fine with their gawking, to me it makes sense why this scene would be triggering for her.