Its the I am no 1 round here and don't you forget it syndrome it starts in the school ground with one kid wanting to be the leader and using tactics so that everyone looks at them so by being mean and cruel they can control and manipulate others into doing what they want.
Why are people so mean to others? Because it is human nature. Humans are mean point blank. Some are meaner than others.
Sometimes because people do things that irritate them. Like not giving a **** about grammar when asking a question on the internet, for instance.
They think they're better than others, so they start seeing other people as annoying. They deserve to be annoyed for their bad attitude though...
They have lots of UN resolved issues. Hate anger use up all the good in you, they need to find how the anger got there, deal with it and forgive. Lifes too short to live angry
Because they have low self esteem this action makes them briefly feel better. But it lasts only briefly so they keep repeating. Like a cigarete.
They hate on their appearance or personality basically
'cos it's a dog eat dog world,
& humans are top dog.
They are liberals
jealousy or they have a bad attitude or personality.
some people are just mean people, who I hate, and it gets me so angry, I don't like to be around them,
idk
They are insecure or just plain nasty.