Leo probably ignored Stargirl because he thought she was weird or unusual. Since she was also a new student, he probably wanted to stay 'chill' with his friends rather than talk to an outsider.
Even though Leo liked Stargirl, he didn't like the fact that his friends were ignoring him because he was with her.
Leo ignores Stargirl because he is pressured by his peers to conform and stay away from someone they view as different. He blames Stargirl's unique behavior for the social discomfort he experiences and chooses to prioritize fitting in over being true to his feelings. This situation reflects the broader themes of individuality and peer influence throughout the story.
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