Some people roll that way. Their childhood (or genes) gave them a personality that enjoys conflict, or that only feels good about themselves if someone else is feeling bad, or enjoys hurting people.

It's most clearly visible in griefers in online games, because the social consequences of griefing are minimal. Some people are just plain nasty.

But I don't think that's what's happening here. And I think it's ridiculous that it's been interpreted this way.