At least in the United States, this isn’t at all true. A disproportionate number of administrators (especially when adjusted for the normal male/female teacher breakdown) are male.
There have also been many studies that show that teachers call on boys more, praised them more (they acknowledge girls, praise boys), and talk with them more.
So your assumptions are completely at odds with decades of data.
[1]: https://time.com/3705454/teachers-biases-girls-education/ — has good links to various research from across the world.