In To Kill a Mockingbird, Cecil Jacobs is one of Scout Finch's classmates. He is sometimes her friend and sometimes her enemy as the story progresses.
Cecil taunts Scout in the schoolyard about Atticus defending an African American man. He uses a horrible word, and Scout can hardly hold herself back from fighting with him. Only her promise to Atticus that she will stop lashing out prevents her. That evening, Scout asks her father what Cecil means, and Atticus explains the situation to her in a way she can understand.
The next day, Cecil is at it again, telling Scout that her father is a “disgrace.” Scout remembers just in time that she isn't to fight, and she walks away because she doesn't want to let Atticus down. Cecil calls her a coward, but Scout keeps walking.
Cecil is only a little boy, and he probably doesn't even understand what he is saying. He is, for the most part, echoing what he hears from the adults around him. Therefore, Cecil's parroting comments give us an idea of what at least some of Maycomb citizens are thinking about Atticus's determination to defend Tom Robinson to the best of his ability.
On Halloween night, Jem and Scout are on their way to the school when Cecil jumps out and scares them. He doesn't mean any harm, but he certainly enjoys his Halloween prank. Scout and Cecil tour the auditorium together, enjoying the House of Horrors and a few treats. Then they put on their costumes and sit together waiting for their turn in the pageant. This shows that Scout and Cecil really are friends, for the most part. Scout doesn't hold a grudge, and Cecil probably never meant what he said about Atticus.