ruffle a few feathers
To do something which annoys, irritates, or upsets other people. I know my presentation about the effects of climate change is going to ruffle a few feathers, but I have got to raise awareness about this issue! Harry's bombastic, arrogant demeanor tends to ruffle a few feathers, but he's a decent guy at heart.
ruffle somebody’s/a few ˈfeathers
(informal) annoy somebody by doing something that upsets and disturbs them: All this talk of a strike has clearly ruffled the management’s feathers. OPPOSITE: smooth (somebody’s) ruffled feathersThis refers to the way the wind disturbs the smooth surface of a bird’s feathers so that they stick out.