I can understand where you're coming from on that, and I respect your right to choose not to accept food that may be offered, yet I have a tough time refusing people when they offer me something they have gone to the trouble of preparing.
While "nasty people's houses" may look that way because the people living there do not have as much money as other folks we may work for and they cannot keep up with appearances due to the fact that they may be working two jobs just to keep their heads above water, there still is pride, I think, in everyone who tries to show us thanks and hospitality by offering us the occasional slice of cake or pie or a tray of home-baked cookies or even some ice tea.
I had these folks who were not too well off, as judged by their yard, come out after we had just raked up the last of the leaves and brush, and they had made home-cooked tamales which they offered us along with a pitcher of lemonade. When we eagerly accepted and thanked them over and over, you could just about see them grow in stature and hold their heads a little higher. They made our day and we made theirs. I think life is a little easier to live that way. I could not imagine refusing their kind offer, just because their house and yard were fairly shabby, complete with the cars on blocks and old dogs lying around.
Hmmm---Now that I think about it, there were four old dogs when we got there and I only saw three when we left. The tamales, we were told, were their "special ones." You don't think-------!!!!!