Rons hair

Harry's was fine (a bit too long for the character though) but Ron's was absolutely hideous.

Both of their hairs were hideous. It just looked so wrong?

As a mom who had teens I can assure you at some point they all had hair styles I didn’t like. So Ron’s hair to makes sense as a typical teen. He was probably trying to find his own identity which would be difficult in a family with lots of kids and your best friend is a famous wizard. You can see in the movie and book he’s jealous of Harry or sick of just being in his shadow. Ron I’d just average and that’s no easy as a teen.