When you were in elementary school, was there ever a kid who didn't like you for no apparent reason?

And I don't mean in the "Girls/boys have cooties and my friends can't know I like this person so I'm going to be mean to them instead" way.

I transferred schools in fifth grade, and from the first day I joined the class there was this boy who would give me the evil eye and kick at my chair if he was ever sitting behind during assemblies.

It was odd.