Why would anyone refuse a free gift?

I want to preface this by saying I’m not looking for a pat on the back or anything for doing this. My intention behind this is to spark some discussion on what happened to me today. I hope this hits you all as hard as it hit me. Now for a story:

On my way back home from Tech today I stopped at Chick-Fil-A in Harrisonburg for lunch. While I was there, I noticed this guy who was sitting in the back corner of the restaurant. He had a lot of stuff with him, and I couldn’t tell if he was homeless and hanging out there or whether he was just waiting for someone. I felt a serious tug on my heart to talk to him, and so just as I was going to leave, I stopped by his table, sat down and said hello. I asked if there was anything I can do to help him. After a lengthy pause, he pointed to I think three dollar bills on the table and said he was about to buy lunch. I offered to buy him lunch, and he was surprised. He asked me “what’s the bottom line here? why?” I told him I wanted to share what I believed in, the love of Christ. He looked outside the building and asked if I was one of the workers there. I told him I wasn’t. He then asked if any of the employees or managers told me to come over. I told him no, and that I was just passing through town on my way home from Tech. He talked about Tech for a few minutes, how he had lived there for a few months, and left because he felt it was a very stressful environment. After that, he just said “well, I think we’re done here.” I stood up, wished him the best of luck, and left.

What seriously troubles me about all this reminds me of some speaker I heard a few months ago. I’m not sure if it was at church or 180, but what kept running through my head after this event was a question that the speaker raised. That question was, “why would anyone refuse a free gift?” After wrestling with this for 10 miles up the road, I picked up my phone and called my pastor to talk about it. He said that it was a hard pill to swallow, and that it hurts us, but to imagine how badly it hurts God when we do the same to him. We got into talking about how some people just get into a place where they don’t want to accept anyone else’s help and how they want to make it on their own.

What do you guys think about all of this? Why would anyone refuse a free gift? What has caused some people to be so skeptical about someone wanting to help them and question their motives?