We may fear the possibility of being incompetent,
or being exploited.
We may worry about being perceived negatively by the stranger.
And we may worry that interacting with a stranger
will bring disapproval from members of our own group.
Generally these anxieties can be reduced
by paying more conscious attention to the communication process,
and by gathering more information on the stranger.
Generally,
individuals tend to explain their own behavior by reference to the situation.
Observers tend to attribute an individual's behavior to elements of that individual's character.
When interacting with strangers
we are especially likely to attribute their behavior to their character,
and then to view their character as typical of their culture or race, etc.