Because everyone in the society is judging a book by it's cover. Everyone goes against Robinson just because he is a black man. Everyone considers Boo Radley a freak just because they truly do not know him. So, the conflict is when they struggle to fit into their community.
In To Kill a Mockingbird, Boo Radley vs. society, and Tom Robinson vs. society are two prime examples. Everybody dislikes Boo because he does not conform to the town standards, and everybody thinks Tom should lose the trial because he's black.
There is more than one conflict in The Hobbit. The conflict with society would be with the river elves or Bilbo interactions with the dwarves as a group. But there is man vs man, man vs society, man vs enviroment
Man Vs. Nature Man Vs. Society Man Vs. Man
it is when man is having trouble with society
Man vs Man, Man vs Nature, Man vs Self, Man vs Society.
man vs man, man vs self, man vs nature, man vs society, man vs fate. =D
I would say it's a combination of Man vs Man and Man vs Society (although both main characters also had to overcome their limitations and prejudices).
Man vs ManMan vs NatureMan vs HimselfMan vs GodMan vs Society
There are many... Man vs man Man vs society Man vs nature Man vs self.
The conflict is Man vs. Man as demontrated in Man vs. Society/the government, and Man vs. Self.
The Plessy vs. Ferguson case was all about segregation. Without segregation, the plot of To Kill A Mockingbird would be different. Also, Atticus is getting talked about badly in Maycomb for defending Tom Robinson.
Man Vs Man Man Vs Self Man Vs Society Man Vs Supernatureal Man Vs Environment