To ruffle someone's feathers means to cause them to become very angry, nervous, or upset. His direct, often abrasive approach will doubtless ruffle a few feathers.

What is meant by ruffle some feathers?

informal. : to upset or offend people Her research has been ruffling feathers for years. His critical remarks ruffled the feathers of the board members. I agreed to do what they wanted because I didn't want to ruffle any feathers.

What is the best meaning of don't let it ruffle her feathers?

To annoy, irritate, or upset someone. Sarah's just teasing you. Don't let her ruffle your feathers like that!