Does Lula speak for the majority opinion in the congregation? why does the author include her in the church scene ?

Lula resents Calpurnia bringing white children to their black church. Lula is bitter about life. She thinks segregation should be a two way street,

 "You ain't got no business bringing' white chillun here - they got their church, we got our'n."

She doesn't understand where Calpurnia is coming from and why the Finch kids are special. The congregation quickly push Lula out of the way and silence her. Zeebo says Lula was almost tossed out of the church for other reasons.Lee uses Lula as an example about how racism can work both ways. Lula dishes out the same racism that is inflicted on her. Racism does not belong to a particular group.