What is an interpersonal stressor?
Difficult situations dealing with other people (communication, relationship, etc.) (Interpersonal) may become a stressor when it is perceived as a threat to one’s well-being or position in life.
The situations that become stressors vary from person to person. While some things tend to stress many people—job demands, relationship conflicts, a hectic schedule—not every potential stressor causes stress in everyone. Everyone has a unique set of understanding of the world around them and ways of perceiving things. What seems like a threat to one person may be perceived as a challenge to another. So you really can't generalize what situations are stressors.
Hope this helps! :-)