Yes, and not intentionally. It's just the way things progress. Although I don't mind them intersecting but I think people like structure, and it's easier if you connect with them in one role because they may not feel comfortable interacting with you in others and may feel intimidated if they think they can't relate or interact comfortably with others in a different role than the one they are used to. I also think it makes people feel a bit "special" in some way to have a particular kind of connection with one person or group of people who they share that experience with, knowing that others may not be able to relate.
For example, I have work colleagues who I can talk to about certain things but can't with others who care about things. I have colleagues who are now friends from shared experiences in college/grad school. When I try to share experiences with those who are not from that area, it's harder to receive empathy because they won't understand, although maybe very supportive. It may also be a matter of setting boundaries.
Maybe we are comfortable occupying one particular role or showing only one side of ourselves in with one group and showing another side with other groups. Sometimes, you can't feel fully comfortable sharing all aspects in one aspect of your life, so you show or project one side, while you feel much more at ease with others in another. So, depends on the people, personalities, and roles.