I could explain both. I'll just make a short note on dictatorship though.
In a representative democracy, you're pretty much depending on the people you elect to do what the population voted them to do. This is alright in theory, but like communism it fails to work in real life. I don't feel that it's too far fetched to compare several representative democracies around the world with dictatorships.. North Korea is a representative democracy too, there's just 1 party and 1 person to vote for. In the US, they have 2 parties with the exact same policies to vote for. In the UK, I see the point he's making too.