Statism

Statism is the ideology that the existence of a state, i.e., a government, is necessary for the proper function of most societies. That's pretty much it, really.

Libertarians and anarchists really don't like statists and use the term as a snarl word to describe anyone they perceive as an ideological enemy, frequently conflating statism with authoritarianism. Much like the way "fascist" is used on the internet, the word appears to be used to say that someone's a "bad person", regardless of its nominal meaning. If acknowledged at all, it is generally greeted with, "So how's your alternative supposed to work?" The unstated assumptions behind its use as a term of abuse say more about the speaker than the target.