We can learn from Harper Lee’s description of the courtroom lots about the racism of the society in Maycomb. For example the black people had to wait behind all the white people and let them all go into the courtroom before entering themselves; on top of this they sat in separate areas which implies complete segregation. This extreme separation already gives an idea of what the result of the case will be as black people are already seen as inferior in every way. It is also supprising that even white children were seen as supperior to black adults as 4 black men stood up to offer Scout, Jem and Dill seats.
Harper Lee writes this scene in a very interesting way as the processes of segregation that take place seem natural and there is no objection or retaliation showing how embedded it is in their society. This links in to the earlier description of the outside of the courthouse, which talks about how the people of Maycomb are determined to preserve the past and stay with their old ways, because this is showing how broken and dated their society is.
React!