Sometimes you just know that you are going to gain nothing from an exchange with someone who displays a certain level of ignorance. In real life, I have walked away from people, shaking my head, and telling them to not be so stupid.Yeah right.
I'll stick with my original definition thanks.
My reasoning is simple, you wouldn't utter 'Dislike', Disagree' or 'Dumb' during the course of a normal conversation because you would look like a pillock and come over as quite clearly thick or having something wrong with you.
Of course I tend not to use them myself because I prefer the effort of conversation, you can learn stuff using that method.