@goodbyestranger
I can't see that the dictionary regards vacuousness as being reserved to girls/women. If it did, I would direct the editor to this video as strong evidence that vacuousness appears to be equally capable of being an attribute of boys/men as well as girls/women.
Yes the dictionary definition doesn’t “regard vacuousness as being reserved to girls/women”. The dictionary gives basic, bald definitions of adjectives and nouns without going into the sexist slant with which they are used. Hence the dictionary definition is largely irrelevant.
What matters here is how the word - and the word ‘vacuous’ - are commonly used in language. It’s the usage which shows bias. I am confident that you’ll find that the vast majority of the time ‘vacuous’/‘vacuousness’ is used to pejoratively describe girls & women rather than boys and men.
Especially when used in conjunction with ‘giggling’. The stereotype of airhead girls is strong, much stronger and prevalent of any equivalent for boys. It is a common way of dismissing and putting down girls/women.
In this case you purposefully used those words to dismiss or put down the girls. You say that the boys’ behaviour was also vacuous. But your first choice of words for them was ‘silly’. And you’re conveniently forgetting that you can’t compare the behaviour because the boys’ actions were pri-active; towards the girls. The girls’ behaviour was reactive. The girls didn’t start the behaviour. If the girls were holding the camera and zooming in on crotch shots of the boys, then you could compare the behaviour. Instead the video’s viewpoint was the bog standard of the term ‘male lens’.