Thread:WitherB0$$398/@comment-30201944-20171129142509/@comment-24634078-20171130001404

So if you're in chat and someone is being disruptive (harassment, spam, etc.) then you can click their name, where it appears on the right. You then have the options to either "Kick" or "Ban". Kick does just that: it kicks them from chat. Ban actually prevents them from joining chat and should be used if they persist even after 1-2 kicks.