I am not going to say hello to greet anyone anymore.
That's mean. I'd like to know why you don't wanna say hello to anyone.
I just don't want to greet, i don't know why.
Greeting someone after meeting them is a harmless and polite gesture. It's rude to not say hello.
I can do whatever I want when I meet people.
You can do whatever you want but if you ignore someone then people will not want to be around you or be your friends. Greeting is something that is expected of people when you know each other and by ignoring people you will be thought of as rude.