It's just that comments that don't add much tend to get frowned upon here. There's generally a lack of "agreeing" comments, the upvote button is used for that.
That could be it. I just wanted to praise the parent as it was a very clever and funny comment, which to me deserved more than "just" an upvote. But thanks for pointing out.
I think if you had said something like "I find this a very clever and funny comment, well done" it would have been better received, but I'm also just guessing.