Having worked on forums before, having a dislike button encourages brigaids. Which also encourages tons of alt accounts, to further the dislike clicks.
And we all know that pretty soon the SJWs will be in here, trying to attack us. Jeremy does a pretty good job of stirring them up :D
And yeah, even just on reddit, having a + that you can click on… it encourages people trying to post for popularity.
One thing that I dunno about. On Nexus where I used to work, we had a system where we could give a person “appreciation” points, called a “Kudos”. But, I’ve seen people even get heirarchal with that too. But I’ve even seen people get uppity with “Well…I have more post count than you do!” or “I’ve been a member here since XXXX and you’re a NOOB!” LOL so people are gonna use anything to get snobby, or think they’re betta than somebody else.