A response to the phrase "just saying."
When a person says something blunt, rude, or offensive, it can precede or follow an equally blunt, rude, or offensive comment to serve as a way of reminding a person that their words carry weight/there are consequences to their actions.
Jeph: Becky, your shoes look like shit. Hey-- just saying.
Becky: Jeph, go fuck yourself. Hey-- just feeling. :)