You can also sprinkle them. [aspersion: (n) An attack on somebody's reputation or good name, often in the phrase to cast aspersions upon (Dict.com)] (label) ...a sprinkling of [aspersions]
Merriam-Webster: "sprinkle" def: scatter or pour small drops or particles of a substance over (an object or surface).
Maybe a sprinkling of aspersions will make them appear more tiny vs. this casting aspersions upon her.
Perhaps a sprinkling of aspersions sounds less inoffensive; somewhat harmless, or innocuous--somehow. Seem like a piddling of aspersions. Maybe because there's less of them. I don't know. Sometimes, if I apply a sprinkling of aspersions on my wife instead of casting, she thinks them funny. Try a sprinkling of aspersions instead. If that doesn't work, you can always go back to casting aspersions upon her, or even try dusting or powdering her with aspersions. See if that works.
Good luck!