Ruby, yes it's very possible. I read almost every thread but didn't keep track of those that I accidentally touched the dislike button. Also, if it wasn't me, I presume there are others doing the same thing. I had intended to make this post earlier but was reminded to do so when reading the thread regarding the songbook. Someone had disliked a seemingly innocuous post and a comment was made that it must have been a lurking JW that did so. I wouldn't take a dislike seriously because it could have been a mistake.
I've also accidently hit the 'flag' button many times but thankfully there is a cancel option on that.
I wanted to post about this because I know many are very sensitive and may wonder for a long time why someone disliked their comment.
I've actually accidentally disliked more than a few comments that I liked but didn't know I could change it until now.