From my experience,often in social interactions, the person who seems more desperate is the least desirable person to be interacted with. And no one wants to engage them.
More often than not, people seems to avoid desperate people,even when that person needed help most. An example would be a beggar on the street, if group of pedestrian walk by a beggar sitting on the ground, most of us would ignore and continue our journey. (I myself did this before) Even though the beggar might be in a dire situation (i.e Hunger, No Shelter)
Is there psychological theories on this that describe the avoidance or disgust from desperate people?