In case you haven't heard, Venezuela went all in on feeling the Bern more than a decade ago. Socialism has been about as complete a disaster there as it's possible for a thing to be. Just to give you one example: How does a country with more oil reserves than Saudi Arabia end up with a gas crisis? I'll tell you how: A corrupt central-planning government mismanages its resources while making it impossible for anyone to earn a profit producing or selling anything.
You say the difference is that Bernie wants "democratic socialism"? I hate to tell you this, but Hugo Chavez was popularly elected, and popular elections have kept his successor Nicolas Maduro in office. The problem is not that the socialism isn't democratic. It's that it's socialism.