The cat is a finicky eater

She is known for being finicky about the quality of her coffee, only choosing beans that are freshly roasted.

What was the name of finicky cat in cat food commercials?

"Many children are finicky about their food, so they don't eat enough vegetables."

No, finicky is an adjective describing a type of person, while rudely is an adjective describing a type of action.

Rudely means impolitely, unmannerly, or uncivilly.

Finicky means a fussy, fastidious, or choosy person.