Not a good analogy.
Try that you go to this rescue mission, get a roach in your food, and complain that there's a roach in the food they give you a lot of the time. Complain loudly about the lousy service the salvation army is providing. Then when someone says, "Hey, calm down, it's free food after all..", you can point out that you have paid at the offering plate before and they should be giving you more.
OK, I think that gets the point across.

