This is why I accuse you all of strawmanning. There has never been a truly Socialist country. Just because some dictator calls himself a Socialist does not make his country Socialist. North Korea calls itself a Democratic Republic. The US is a Democratic Republic. Are both the same?
Do I need to write a list of all the failed Democracies in the world? What do they have in common with most countries that call themselves Socialist? Corruption, not ideology. Why should I even debate you, when you call a country something that it's not, and then claim it's an example of the failure of the principles that it's not following? Sorry, but that's strawmanning.
There are plenty of countries that combine the more positive aspects of Socialism and Democracy, and benefit from it. Since you'll ask for an example, look up Kerala, in India.
It might interest you that there have been elected Socialist leaders in the past in South America that haven't brought their countries to ruin, but you'll never hear it from the right.
Do some real research, it might do you some good.