Considering Aziraphale a friend was a stretch for Rocket Raccoon, but the angel wasn't opposed to becoming the not-raccoon's friend. He just wasn't certain that sitting down next to the guy and talking about grilled cheese necessarily made him Rocket's friend.
Though he would not deny there was the potential. There was always potential.
"Best grilled cheese? Well consider me sold," Aziraphale said, offering the little guy a small smile. "You shouldn't be used to crappy service," he mused. "Just because you look like a raccoon who can talk doesn't mean you deserve subpar service."