What is hostility of the margin?
I've never heard this term before -- and cannot even find it in a Google search.
Go back into your text/study materials and see what you find.
Do you possibly mean "hostility of the marginalized?"
Sorry Hostility of the marginalized?
Check this article about marginalized people.
http://en.wikipedia.org/wiki/Marginalization
Do you see the reasons why they may be hostile?