Of the folks I know with lots of legos, most are either indiscriminate masses to build stuff with, or they are Star Wars. Guys collect the vehicles, and gals collect the dioramas.
For the masses of legos, both sexes like them early on, then all but a few of the girls just stop beyond a certain level of complexity and move on to softer mediums.
I was noticing in the Amazon Toy Catalog that there weren’t any military toys. There were girls’ toy sections and generic toy sections but no sections that could be counted as boys’.
There are generic Lego companies on the web, from China, that provide military Legos. Even German and Russian WW II tanks and soldiers. Woke parents will be surprised. The following is one.
https://thebrickbattle.com/lego-ww2-soldiers