What do you mean what makes them proud to be haitians? The same way you are proud to be black! Why do you think you are so much different from them? You are black just like they are, you have had it bad like they have due to your skin color.
Just because you are in the United States don't think you are better than them, and untill you have walked in their shoes you might will understand why they are proud to be Haitians!