In chapter 24 of To Kill A Mockingbird, Scout listens to the white ladies of the Missionary Society, especially Mrs. Merriweather, talk about wanting to help blacks in Africa while at the same time coming down hard on African Americans in their own community.
Mrs. Merriweather talks about having to scold her maid, Sophy, for being surly after the Tom Robinson verdict. Mrs. Merriweather is hypocritical in pretending that she hires Sophy—at stunningly low wages even for the Depression—out of the goodness of her heart because times are so rough. In reality, it is clear that Mrs. Merriweather benefits from a Black community that she can exploit. She is also cruel in expecting Sophy to be cheerful and grateful in a situation where it is obvious blacks are treated unjustly by whites.
Mrs. Merriweather also makes comments implying that Atticus is to blame for the African American community getting "uppity." If he hadn't defended Tom Robinson in a way that made it clear he wasn't guilty, African Americans wouldn't have reasons to be upset, as they now are, about the guilty verdict. These comments make Miss Maudie angry, and she comments that Mrs Merriweather has no trouble eating Atticus's food while at the same time criticizing him.
There are many similar examples of hypocrisy in our world. People will get behind, for example, the idea of better education for children, but when it is a matter of building a new school in their own neighborhood to relieve overcrowding, they will say "not in my backyard," and campaign against it.