And is a felony, to boot.
It can also be a misdemeanor. I know of a guy who got involved in a dispute between his neighbors and some strangers who were harassing them. He made some aggressive statements during the confrontation which the strangers were shrewd enough to record. That got him a felony charge of terroristic threats which his lawyer was able to get reduced to a misdemeanor and probation.
The lesson to be learned here is not to get involved in other people's problems. If you can't do that, call the police and stick them with the job of protecting the victims. If you are already involved, try to get your friends and yourself behind locked doors on your own property. You need to present a picture, by word and deed, that you did everything you could to avoid trouble. That sets up the aggressors for charges.