It's kind of ironic, because Elijah has just won a decisive victory against Jezebel, the queen of Israel. After all, he beat them fair and square. But no, instead of admitting she was wrong, Jezebel sent out her whole army out to hunt him down and kill him. Now, all this had Elijah pretty depressed. But Elijah was depressed, and depression doesn't respond to logic or reality as it is.
Depression just knows what it feels .
And that's where Elijah was. Everyone hates him for it. And what's more, he feels alone, that nobody cares what he did, that his act made no difference to anyone. He gave it his all, he gave it his best, and his best wasn't good enough. Now everybody hates me, everybody's out to get me.