Why Do Some People Get Offended By Generosity?

If you have begun a life of Biblical generosity, then you have run into this problem:  A generous gift is met with awkwardness, disgruntled distance, or perhaps even offense.  As we begin to give liberally, we will eventually run into a situation where our giving is met with a strange and uncomfortable resentment.  This post is for my audience.  I want to hear what you all think.  I will combine you answers into a post in a week or two.  Respond here, to give me your best explanation for this unfortunate occurence.