You strongly disliked Ron. But he didn't even know you.

you thought he was dopeish, a meat headed dumb jock who doesn't care for anything but sports.

and you were the complete opposite, you liked meaningful interactions, and books, and metaphors everything like that.

he didn't even know you were, until you had your head in book in the middle of the hallway.

It was after a quidditch game so he was walking to the showers when he turned a corner at ran right into you