There was a time where I really began to hate people... and I do mean hate in its real sense, not just a word thrown out there for dramatic effect. In that state, I was actually relatively easy to be steered by other influences. People who haven't fully grasped who they are, or who lose sight of it, can be easily pushed outside of their desired character to behave in a wide range of ways.
The more concerned a person is about how others see them, how close they are to one objective or another, etc, the less attention they pay to where they are actually standing. People who do not know where they are standing can be made to take completely nonsensical and contradictory positions with no foundation - no true value system - supporting them.
After some great news, and a later ability to speak with someone who I'd lost contact with over some time, I was able to better understand why I was enraged to begin with, and that what mattered wasn't really the rage or the expression of it - but the security and well being of someone I held very dear to me.
As for general friendships... it depends on how well that person knows who they are. Two friends, who connect on an intimate level (you get what I mean, perverts), are probably almost never going to be able to push each other into hating each other. There are people out there who, it really wouldn't matter what they did. It might hurt... it might be confusing. It might even provoke a temporary action of hostility... but in the long run, anyone I've truly felt I understood on that level would want to be understood in those actions, as well.
In fact, the person I hold most dear to me... frankly, not even sure she exists. Sure - it would be an incredible troll pulled off for ... some reason I can't even possibly begin to imagine... but it's not outside the realm of possibility that it's all been some clever ruse to **** with my mind. Sure, my brain runs rampant with all the oddities surrounding her - but at the end of the day, she could even decide to kill me and I would be less angry about it than curious to know why it was she felt that way.
However, I am not the most common type of person. There are quite a few people out there who are more results-driven. They put into a friendship or something else and then expect things out of it. A return on investment, so to speak. Which isn't unreasonable - but it means that many people invite strings into their relationships and dealings with others because they want to treat their time with others as an investment expected to produce a return.
When to tie a string to a deal, and when to simply let an act be an act... that is a sort of art all on its own, and can easily become a web of social manipulation where there are no strings... but a web of control just the same.