On another board the moderators established a dislike button.
Soon members were at war, disliking each other because one disliked the other first.
I actually liked the dislike button and would reserve it only for those who were truly on the board to make trouble.
But of course like almost everyone else I got caught up in the dislike war.
And the moderators got rid of the dislike button.
How about a limit? 5 dislikes per week. Resets every Sunday. No rollover.
So, you'd have to ration your dislikes or you would run out just when you REALLY needed to dislike something.
Just a thought.
And, if mods see you slinging your dislikes at one user no matter what they post, they can disable your button for a short time.