Lula does not speak for the majority of the congregation. In fact, she is the only member of the congregation of the First Purchase Church to comment on Jem and Scout's attendance. Every other member of the congregation genuinely welcomes the children to their Sunday service. I would assume Lula's behavior is included because there's "always one in every crowd." None-the-less, this is not specified in the text. We can infer that there might possibly be some racism to overcome in both of Maycomb's communities.
To Kill a Mockingbird