Face it, labels exist. You might as well deal with it.
And even though we are all people, it can be kind of..fun to catagorize eachother.
Unless stated otherwise, people of a certain label hang with each other.
Some of these are 'traditional' labels, some are relating to social hierachy type stuff, some are to do with personality, some are to do with interests, etc.
image from deviantart.