He doesn't like walking on even slightly wet ground.
It makes his shoes squeak. He H-A-T-E-S for his shoes to squeak.
She thinks he's being ridiculous. And that he needs to grow up.
So she nudged him off his dry patch of curb, where they'd been balancing, onto the wet grass.
When he started to cry she felt sorry for him.
Until he punched her.
Now they're square.