stupidity is so close to poverty, do you agree with such a phrase?
if it yes, means the poor are the fools.
I want to know your opinion.

I would say that this statement as a whole is stupid. Pour people in general are not stupid, they have to survive on small amount of cash so they are wise and know how to ration and make things work with what they got.
There is some truth if you rephrase the statement - pour does not have the same opportunities as others, inmost cases they have to go to hardest route just because they do not have the means or information, again because they are busy with working and surviving.