This is a thereotical question if everyone on the planet was identical,and there was an equal amount of (identical) men and women (all same age) would people still hate each other and fight each other?
I think so yes. We will always find some excuse to fight each other. If everyone was identical, the people living north of the river would hate those living south of the river.
If everyone lived on the same side of the river, the right handed people would hate the left handed people.
If everyone was right handed, the manual workers would hate the intellectuals and so on and so forth.
And when everyone had killed each other and there was only one person left, he'd probably hate himself and commit suicide.
If you mean if everyone was identical in every way, looks, personality, thoughts etc then they would all have the same job and the same life. All men the same, all women the same.This might mean everyone of the same sex would get on really well! Not sure about the men and women though, they'd either all love each other or all hate each other!