expression, godan verb (-u)
insult each other; trade insults; verbally abuse each other
Describes two or more people exchanging insults or harsh words. The verb is intransitive and implies mutual action.
兄弟が罵り合っているのを聞いて、母が怒った。
When she heard the siblings trading insults, their mother got angry.
ネット上で見
It's common for strangers to insult each other online.