Yes, you usually get something.It depends on where the Hate came from:
On p. 101, it explains what happens when you get a new Hate by GM action:
GMs can add a 3-point Hate Relationship as a consequence of a throwdown or other major event. Unless the Sleuth went out of her way to earn the Hate, the player gains 3 Relationship build points to put into other Relationships.
But if a Love turns into a Hate, that's a Major Shift (p.98) and instead you are offered a Cool refresh to transform the Relationship:
...giving the Sleuth a Cool refresh of 5 points. If the Player accepts, the change happens.
On p.88 it is explained that the results of player actions do not earn the build points:
Hates are a trade-off. They are a liability, and will make your life hellish. But at character creation, the GM awards you extra Relationship points if you have a Hate. Your friends may be more protective, bond more tightly since you've fought off this aggression together. You don't get that bonus if a Like or Love turns into a Hate, or if a new Hate appears during play thanks to the character's actions.