name-calling 
noun [mass noun]
Abusive language or insults: the party’s internal bickering and name-calling...
- Meetings sometimes end in shouting, name-calling and insults.
- It gets to be quite fun, in an awful kind of way, to spot the childish name-calling, the insult words that don't mean anything.
- Most of the incidents involved name-calling, verbal abuse and racist comments, rather than physical assaults.
- party-like
- party line
- party-liner
- party-lining
- party list
- party machine
- partyman
- party manners
- party-mindedness
- party mix
- party monster
- partyness
- party piano
- party piece
- party plan
- party platform
- party political
- party political broadcast
- party politician
- party politics
- party pooper
- party-pooping
- party popper
- party room
- partyship