Be grateful. You probably have encountered them, and they are fucking insane. Basically rampant capitalists who don't want to pay any tax, or support any form of government.
And they don't see the contradictions, because they are stupid.
In answer to the OP - yes anarchism - as a whole or part of a description is absolutely genuine, but you need to understand precisely what they believe. I call myself an anarchist/socialist, which is really about anti-authoritarian socialism.
Obviously, some people just use it as a posh way of saying "thug".