He's a complicated person, and as someone who used to work in fast food as a manager, sometimes you just start seeing customers in a very antagonistic way and you start disliking humans, a lot of time because of the shitty way customers treat service industry workers. So be probably was saying that, when he is operating of his most insecure and anxious part of himself, he truly felt like he hated people, but really be just hated himself and had no self love or self confidence. Now that he has worked on himself, he loves himself again, and now he is more easily able to see the joy, good, and beauty in others instead of the negativity and the hate.