I'm going to stop the sale of a house to my brothers childhood friend
Why don't you want him to buy the house?
I don't want him moving close to my house; I hate him.
While it is rude to mess with someone else's plan to buy a home, it makes sense. Having a difficult neighbor can make your life much more difficult, so it is only natural for you to not want that person to live there.
I can't be happy until I made him uncomfortable.
It isn't a good thing to take pleasure from someone else's misfortune. That just comes off as really petty.