The world is a Macho place; both the men and the women enjoy testing the people from more developed countries. They wish to know if we are clever, smart, and capable of taking care of the world and ourselves.
When you allow other cultures to take advantage of your good will, you are being a chump. They know, and now you know it, please go forth into the world and be a good ambassador to your country.
Treat all cultures the same as you would treat you own, it is an extreme insult to belittle another culture by not treating them the same as your own culture because you feel them poor or weak, they are not.
Example, I had my clothes cleaned yesterday by a nice girl of the village, she forget to return one shirt, I walked down this morning and picked up the shirt of the clothesline. I looked at her, she looked at me, I will never know the reason, however for sure I was strict enough to require her to give me all my shirts, convenient problems are often beneficial to a macho person.