I'd argue it's more of a balance, characters like gaston fall more into the 'frat boy' side, a himbo can have a mean or smart side, or both, but they must have a bigger goofy side that is the core of their persona.
Like they have a super smart character hidden beneath the layers of stereotypical dumb, and you have to actually pay attention to see it.
Think Steve from 'Stranger things', Or Joseph Joestar from 'JoJo'
They are considered himbos, and they have both smarts and some kind of 'mean spiritedness' to them, while still having lovable traits that superseed those sides.