What evidence do you find in his speech that Dr. King was out of touch with social realities?The March on Washington proved to be a turning point...

From the question, it sounds like you are saying that the
"I Have a Dream" speech was out of touch with social realities at the time that it was
given.  I suppose that you can make this argument, though I would disagree with it to a
large extent.

You can say that this speech is out of touch
because it emphasizes the legal segregation that was going on in the South at that
time.  You can argue that it ought to talk more about the economic conditions in the
ghettoes of the North.

You can argue that King should have
talked less about brotherhood and religious imagery and talked more about how angry
black people in the North were getting.

But to me this is
an unfair criticism because in 1963, the legal segregation was still there.   As long as
that was still there I do not think I agree that other things were the "core of racial
problems." I think you have to get rid of that first and then move on to economic
problems (as King did between the passage of the 1964 Civil Rights Act and his
death.