Not sure why, but I was thinking about this earlier. It's not uncommon for Primary school aged children to act like the opposite sex is "Icky", but personally I just never really understood why.
Sure, I acted like I did- whenever my friends acted this way I would pretend that I felt the same. A part of me knew that the way the girls were treating the guys was unfair (and vice versa) yet I'd go along with it anyway, because my friends would say that if I hung out with the boys we could no longer be friends, that I had to make some kind of choice.
It was always annoying to me back then that if I so much as talked to a boy, teachers would both tease us. "Oooh, did he make you laugh? Do you like...like him?".
Um no I just laughed at a funny joke, because it was funny, it doesn't mean I like him that way.
Little did they know that I would end up being gay once puberty hit...
One time I was over at a friend's house, we were trying on dresses and practising for this Summer event we had to go to, and her little brother kept trying to get me to play with him. So, I kept switching from helping to build toy towers with her brother, to practising and discussing our roles at this event we had planned.
The other girls thought it was weird that I wasn't just ignoring him, but I just felt bad because he seemed lonely and bored, so I wanted to stay for a short while and help him build their tower.
Not sure why he kept coming over and asking me specifically, perhaps he could tell I was bored too, most likely it was because I was the only one who wasn't ignoring him.
Even in Secondary there was this gender divide, but at that point I'd given up caring what my female friends thought and started hanging out with people of all kinds. 
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Near the spectrum but not on it.