It's short sighted, and a lazy use of language which sadly probably reflects the attitudes of some of the staff.
Which means that, no matter how careful they think they are being, those attitudes will be being voiced somewhere, somehow.
Like when I collect ds from school, and he has (yet again) got filthy in the sandpit, or trashed his joggers, spilt stuff everywhere, and generally been a happy, productive 4 year old, and the teacher rolls her eyes and trots out 'oh, that's boys for you!' She must have a short memory, because dd2 was just as often in exactly the same state when I collected her (same teacher). The same teacher expressed surprise (to me, but in ds' hearing) when ds told her he wanted a pink elephant for Christmas (because why would he want a pink one?).
It's insidious, and horrible.
And it should be challenged, because yes, it means that someone somewhere thinks that the 'occupations' are more suited for boys dress up, and that the girls will all stick to the princess stuff even if they have a choice. Depressing.