Yep. I'll try to make a short summary of some arguments in the article and comments:

Why people want to be mean:

• it signals strength (in the ancient environment it shows you are not afraid of being hit in return);
• it signals intellectual superiority e.g. in the form of sarcasm;
• if you already have a reputation, you can win debates quickly;
• it helps you put distance towards people you want to avoid.

What are the negative impacts of meanness:

• you may be wrong, but you have already proposed a solution ("the other person is stupid");
• if there is a misunderstanding, hostile reaction lowers the chance of explaining or increases the time needed, compared with a polite request for clarification;
• people will different experience will seem especially wrong to you, so this effect will be even stronger there;
• you spread bad mood, which harms curiosity and exploration;
• you signal that you are bad at cooperation, bad at managing your emotions, not caring about other people;
• people stop listening to you and start avoiding you;
• you lose possible allies.