That boy is a lot of trouble. It's a good thing his parents 'aren't' easily 'ruffled'. [=don't become upset easily]
His critical remarks 'ruffled some feathers'. = His critical remarks 'ruffled a few feathers'.
I agreed to do what they wanted because I didn't want to 'ruffle any feathers'.
(..) He was full of pep. Must have had his grande latte enema. Like so many others, I had become a slave to the Ikea nesting instinct. Yes. I'd like to order the Erika Pekkari dust ruffles. - Please hold. - Anything clever, like a coffee table in the shape of a yin-yang, I had to have it. (..)1999 Fight Club