Over time, due to increasing alienation under capitalism, more men are seeing women as these inaccessible alien beings that they desperately want so they can prove to the world/themselves how manly they are, but can never have for one reason or another.
So to them, femboys are the next best thing because they're feminine like women, but are men, so therefore more "accessible".
Actually I think it's that they're cute, and we've reached a point on the graph where the line tracking "cultural acceptance of male-male love" is bein' outpaced by "dominance of ironic affect."