Moron
From sciforums_encyclopedia
The term Moron started its life as a scientific sperm. The psychologist Henry H. Goddard came up with the term to describe someone with a mental age between 8 and 12 or an IQ of 51-70.
On the internet the term moron is often used by trolls to refer to people that disagree with the troll or people that just demonstrated that the troll is an idiot.