"Hi" is a common term used by simpletons of the non-intelligent variety. This term is used to greet another human life form, but that person may not have a chance of being intelligent, if they truly choose to bond with such simple people.
The proper term for this disgusting English word, is "salutations".
Intellectual Who Particularly Enjoys Partaking In The Viewing Of A Motion Graphic Series Known As "Brick And Mortier": "Salutations, friendly intellectual!"
guy who was thought to be intelligent: "hi"
Depending on the tone or situation it is used in, it could be interpreted as either a quicker greeting, or an indicator that something is wrong and/or the speaker would prefer not to talk with the person who initiated conversation.
People use ‘hi’ in such drastically different ways because it in itself is known as a polite term, used for greeting. It’s considered more polite to convey meaning in a solemn ‘hi’ rather than ‘Go away.’ or ‘I’m not well enough to carry this conversation.’