The phrase "salty side" refers to a person's tendency to feel angry, bitter, or resentful. It describes someone who easily gets offended or holds grudges. Full definition
I've eaten this spicy, salty side dish in both hole in the wall and upscale taco joints and the taste varies slightly from place to place. (theothersideofthetortilla.com)
The egg noodle and chicken dinner we ate that night offered a more disconcerting salty side to the stereotypical spice of Thailand. (theexpeditioner.com)
Instead of adorning the pancakes with my favorite savory and salty side dish I decided to serve it with some fresh fruit. (laphemmephoodie.com)