Joseph stalin's reply to the "iron curtain" speech starts at beginning but you can stop reading after the sentence "and they know how to stand up for themselves." by comparing hitler and churchill, is stalin exacerbating the cold war? how or how not? how does stalin refute churchill's theory that communism is growing due to the "proselytizing" soviets? who does stalin blame for the start of the cold war?

By comparing Hitler and Churchill, is Stalin exacerbating the Cold War? How or How not?
From a Western point of view, Stalin's comparison of Hitler and Churchill indeed exacerbates the Cold War, because he is painting the English and their allies with the same brush as Hitler's racism because of a belief in the superiority of the English-speaking people.  From the Soviet point of view, the idea that Western democracy was inherently superior to their communist way of life was seen as the thing inflaming the Cold War's tensions.

How does Stalin refute Churchill's theory that communism is growing due to the "proselytizing" Soviets?
The Soviets had a right to protect themselves, to ensure their security for the future, after having lost 7 million people.  Stalin also asserted the growth of communism as a "normal function," in line with communist theory.  Marxism believed that communism was historically destined to come to pass throughout the world, and the growth of communism in Europe was a sensible reaction to fascism.

Who does Stalin blame for the start of the Cold War?
Churchill and England and their American allies for believing that they are the only "only fully valuable nations" that should rule over the rest of the world.

It might be the second one