Colleague keeps cutting their nails with nail clippers at their desk every week. Clips onto their desk then brushes them onto the floor. I'd say there is a time and a place at home to do that, not at your desk at work!
Would IBU to ask our manager to tell them to stop it, as clearly my disgusted looks at them are not resonating....
YABU - Leave them alone
YANBU - Yuck! Speak to the manager!
Edited to add - Colleague is cutting their finger nails.