I went to an all-boys hs and it’s definitely better than being around foids nonstop. It was a great environment for growing, in all aspects of life.
Importantly for incels, without foids, males compare themselves with achievements whether it be artistic, academic, or athletic. Nerds can succeed in at least the first two and gain respect from being successful in that. In a setting with foids, the only thing that matters to foids is how attractive you are. Your entire worth and pecking order in school will be determined by how many bitches you can pull.
I went to coed k-8 school and college, so I have seen the difference females make. Heck, my school had a sister school, and when the girls would come to use our facilities, you can see guy’s demeanor’s change so much. It’s remarkable how a Chad can interact with a foid once during Track practice and snap her up. A guy can always meet girls through external activities, if he’s so inclined, so I don’t see the downside of sending your son to an all-boys school. Men end up forming fraternal organizations even into adulthood, for obvious reasons.