How do I get people who I really dislike appearing in my life?

You avoid them or tell them to stay away from you. Sometimes we have no choice having them in our life, like family members or teachers until we're able to get away from them for good. Bullies should be reported to the appropriate people who can act on it whether that be parents, police, school authorities. 

Avoid them stay away and find more humble people 
Goood luck 

Just be really mean to them. I really wish I could have told my ex-boyfriend who wouldn't take no for an answer that I hated him and wished he had been an abortion instead of an adoption. When you're mean to people, people don't like you.

If you dislike any people appearing in your life ,you can ignore him,you should not talk to him to much.You can make him understand that you don't him

Sometimes that is not possible.  IF you run in the same circles, it is bound to happen.

become a monk and live in seclusion is the only real way.

Don't do anything to encourage them, tell them you're busy, and/or just block them.

Simple.. relocate to another town, another state and/or another country.  Leave no forwarding address. 

The best way to help you understand more about the psychology of human behaviour is to read; 
The Six Pillars Of Self Esteem by Nathaniel Branden and also read Transactional Analysis by Eric Berne.

Phone them,ans scold a little to.

For most of my early years, I kept getting a certain type of nasty bully enter my life (Not the same person, but all with the same trait) . They'd say really nasty mean things to me. I'd go home so upset and even lose sleep wishing I had 'said this/said that'. As I got older, I did think of something to say back, but didn't because I didn't want to hurt their feelings (??!!)  This went on for a few more years, And then it hit me - why should I care about their feelings when they clearly didn't care about mine?!! The first time was the hardest, but it got easier the more I stood up for myself. Ever since, I notice people with this trait don't come into my life anymore. I think it's 'lifes' way of teaching us to overcome these problems by having them repeated until we do. 

Maybe try to find other circles of friends and acquaintances. Lol. Now that Yahoo answers is going away, it might be good for a lot of us, since we will be forced to do that, at least to some extent!

Become a hermit.