Why does garp hate him?

>Dragon, following in his father's footsteps, rose to vice admiral of the Navy.
>He was tasked with protecting a Celestial Dragon, Garling's daughter.
>Thanks to her, he learned about the horrors committed by the CDs, but he also fell in love with her. She hated her lineage and wanted to be free from her family.
>Dragon then "kidnapped" her and deserted from the Navy.
>Eventually, they had Luffy.
To spare Garling the shame, the official story is that Dragon killed her. Dragón was the only one to able to harm a CD and survive, becoming "the most dangerous man in the world."
>Shanks is Luffy's uncle.