Related Clues:

• Picks nits
• Is nitpicky
• Acts the nitpicker
• Complains unreasonably
• Moans and groans
• Fish small — makes complaint
• Bellyaches or complains
• Pedantic objections
• Fault-finds to a fault
• Shows displeasure (at)
• Slight criticisms
• Complains fish start to smell
• Complains: parking clamps ultimately put on wheels