What were the negative consequences of washington’s point of view according to w. e.b. dubois? what did he think african americans should do?

The "Washington" in this question, of course, is Booker T. Washington, an African-American leader. Washington advocated gradualism.  That meant being patient and doing what white society would allow, which meant changes and better times for blacks would come slowly.
A different point of view was taken by another leader in the black community: W.E.B. DuBois.  Dubois noted that Washington's approach was not accomplishing any real gains for blacks.  He also felt that Washington's point of view showed acceptance of the racial inferiority of blacks.  Plus he saw that institutions in the black community were being dominated by persons like Washington, rather than really empowering all individuals for themselves.
DuBois argued that all black citizens should have the right to vote, equality as citizens, and access to education according to their abilities.