How does HN handle trolls?

Here’s what the guidelines say:

“Please don’t complain that a submission is inappropriate. If a story is spam or off-topic, flag it. Don’t feed egregious comments by replying; flag them instead. If you flag something, please don’t also comment that you did.

Please don’t use Hacker News primarily for political or ideological battle. This destroys intellectual curiosity, so we ban accounts that do it.”