Acommon micro-level pattern involving social interaction is that social stratification is not usually evident in everyday life.

I believe the answer is: people tend to socialize with others of about the same social position.

In general, people tend to automatically like another people they could relate with (usually because they have similar likes or past experiences)
This often cause most people to only socialize with someone that they identify to be in the same social group as them.

Since the time there were born it depends, there's fun violence, abuse, r@pe, kidnappings, threats, hostages ect.