Personal insults
Invading one’s personal territory
Uninvited personal contact
Threats and intimidation, both verbal and non-verbal
Sarcastic jokes and teasing used as insult delivery systems
Withering email flames
Status slaps intended to humiliate their victims
Public shaming or status degradation rituals
Rude interruptions
Two-faced attacks
Dirty looks
Treating people as if they are invisible
More on how to avoid being an A-hole and how to deal with one: Here