I didn't say it was useless, I said that I find it useless. Not the same thing at all.
It's not my intent here to comment on the utility of the feature in any universal sense - my comment is about the disparity between the reactions of different people. And it's just a casual observation, I'm not trying to argue for any thesis or anything here.
If you read the comments in detail you will see that people describe how they used the dislike count. It's therefore not useless.