A troll is someone who causes trouble in comments or chat using insults or other inappropriate behaviour, usually with the aim of provoking a reaction in others. Trolls want attention, so the motto, "Don't feed the troll" is a good approach.
If you notice a troll in the chat or comments please ignore him or her and don't be provoked into responding. Please instead report the troll to a moderator or to our customer service. We'll investigate and can block or ban the troublemaker.