Xenforo also has a hidden dislike feature if you know how to activate it.
I do but I wouldn't enable it as "dislike" for the potential abuse factor. We could definitely use a red thumbs down as "disagree" or something to that effect. Though, my thinking is if you like a post, like it... if you disagree with it, quote what you disagree with and see if you can come to a mutual agreement. Merely reacting and disagreeing with a post really does nobody any good.
I really like just the "like" option myself where if you like a post, like it, and if not, keep scrolling or reply why. However, that is only my opinion and we're still collecting what you all would like to be seen here.