A massive twat. A pretentious prick who takes it upon themselves to interject their own moral principles into a situation even when it clearly doesn’t concern them. Once they have inserted their bullshit they ride their moral high horse off into the sunset.
Arrogantly believing oneself superior to others, often by putting down large groups of people. In usage, such a person is described as "on a high horse" or may be told to "Get off your high horse."
"Get off your high horse" is an idiom people retort with in an argument when the other person is acting like a holier-than-thou being when in reality, they aren't. To put it in a simpler manner, to tell people to stop acting as if they're the top authority when they aren't.
Person A: "I am completely entitled to go around dismissing people when they do something completely normal just because they're wrong and I'm ultimately right."
The uncontrollable urge to correct anybody at any time. Most people tend to claim they are correct even down to opinion. Large amounts of insults and arguments are to break out by these people.
"Wow Anon is being really annoying with saying blue is better than pink."
"Don't take it personal, it's just his high horse syndrome."