Delta's Links
Just like all land-breathers, his hatred towards her is no exception. The bitter taste of defeat still lingers since his fight with her ended in a loss.
Originally taken captive by Delta aboard his ship, that's also where she met Mal and Ren, her Doublade pair. With their help she was able to force her way out, and she easily took down Delta in the process. She's probably a reason he hates 'land-breathers' like her.