Signal posted this very good little summary:
One of the basic Buddhist teachings is that that which is inconstant, is not the self and is stressful.
Identifying with things that are inconstant (thoughts, emotions, body, possessions) leads to suffering. Buddhists aspire to make an end to suffering.
Pineal says:
yes, though if it is not right for you, and you correctly, for yourself, identify with one of these, then Buddhist practice can become self-hate. Not one specific to you as an individual. I, Steve, am bad. But rather in the act of disidentifying, one is attacking that portion of the self.
The Buddhists would question your "and you correctly, for yourself, identify with one of these".
If somebody experiences no suffering and is already totally satisfied and blissful, then he or she has no need for Buddhism. At least right now, at this moment. The inevitable cessation of the conditions that cause the bliss might turn out to be very stressful when they finally appear.
But most people aren't already totally satisfied and blissful. They do suffer, even suffering subtly when they think that they are happiest. And many people dream of some heaven, some promised paradise, where everything will finally be... right.
If that's the case, then a person might feel the need to find some path to salvation, I guess.
The Buddhists locate the ultimate source of our dissatisfaction in our basic sense of self. It's the deepest thing, the thing that we feel the most need to feed, the thing we are most determined to protect and most reluctant to surrender. All of our attachments to everything else in the transitory world of flux all trace back to our attachment to that.
And the Buddhists believe that kind of solid inner core is an illusion...
So yes, there probably is something in Buddhism that might look to some observers like self-hatred. But it isn't "hatred" exactly, since hating the self is really no different than loving it. Both loving it and hating it are still just forms of dependency on it.
Trying to violently slay one's imagined but nevertheless fascinating inner self isn't the right way to approach this. If that was all that there was to it, then suicide would be the perfect shortcut to nibbana.
What a Buddhist needs to learn is how to be dispassionate about, and no longer dependent, whether positively or negatively, on what's happening to their own supposed self. That's what mindfulness is all about. The goal isn't to forcibly suppress one's self, it isn't to squash a fantasy into non-existence. The object is simply to be non-judgementally aware of what's actually happening, of how perceptions and thoughts are linked and cause one another in the inner process.