Why does Jesse feel sorry for Leslie on the first day of school ridge to Terabithia?

Jesse feels sorry for Leslie on the first day of school because she is an outsider who doesn't fit in with the other kids. Her unconventional clothing and unique personality make her a target for ridicule, and Jesse recognizes that she is struggling to find her place. Despite his own insecurities, he empathizes with her situation and wishes she could be accepted by their peers.