snotty-nosed brat

Translations
сопливый нахал
She called him a snotty-nosed brat after he made a rude comment.
Она назвала его сопливым нахалом после грубого комментария.
Definitions
A derogatory term used to describe a child who is perceived as rude, spoiled, or ill-mannered, often implying that the child is also physically unkempt (such as having a runny nose).