Willie Oleson also hates Johnny Johnson, mainly because he looks like a scarecrow in somebody's garden. I dunno about all that, but he's not my style of dreamboat, fo' sho'. Check out the reactions of the students when Johnny Johnson arrives in class.
Laura likes him, though, so she invites him to walk home with her and Mary. They pause for some rock-throwing, which Mary sucks at. Johnny (I wanna keep calling him Johnny Johnson - maybe I will) encourages Mary by telling her "you never know when you'll have to hit a varmint". That is pretty good motivation when you're living in the sticks.
The next day at school, Mary wins the class spelling bee, impressing Johnny Johnson. The next afternoon, he shows up at the little house, which sends Laura running to the loft to spit-smooth her hair in the mirror before coming down to see why he's there. Unfortunately, he only wants Mary to tutor him, and wants nothing to do with little Laura.
The next day, Laura comes up with an elaborate scheme of falling into the creek first thing in the morning, soaking her dress. Uh oh, now she's gonna have to wear her Sunday dress and ribbons and look all pretty for Johnny Johnson. Ma shows up at school during lunch hour to talk to Miss Beadle. "Boystruck... Johnny Johnson?" Ma whispers to Miss Beadle. Haha, I love concerned Ma.
"Oh, Pa." And we never [EDIT: 'rarely'] have to see Johnny Johnson again.