Unless you are limiting your comparison to just the homeless in America, this is just not true. Most people don't know much about life in the Soviet Union in the first place, but even what people do know is typically limited only to life in Moscow and Leningrad. Dismissing the conditions as "capacity to buy junkfood" is uncalled for.
I don't know where in the Soviet Union you were born. But, the stories I've heard of life outside the cities are completely unrecognizable to the modern American experience outside of the most extreme rural and isolated environments available.
