I work with people who cut their nails at least twice a week at work. Every time I hear them doing this, I cringe. Don't you think they should groom themselves at home?
Calm down. If these are normal, clean nails that are being cut so frequently, with the ends dropped carefully into a wastebucket, you're overreacting.
Try thinking these thoughts:
1. Perhaps these obviously clean people are extremely busy at home and find this is the only time they have to groom themselves.
2. Perhaps the work they do requires trimmed nails.
3. Perhaps this is no big deal and you should hum to yourself when it's taking place.
From The Toronto Star (link expired)
MY COMMENT: The real question is: Is it alright to cut your nails during an interview?