That seems like a pretty loaded question.
You have attributed malice to something that may have been an understanding. Liking how a potential buzzword sounds shouldn't (in my opinion) be equated to enjoying the misery of others.
"Unicorpse" is a fun word (in my opinion). Although it might be offensive, it is also fun to say. I don't think the user was showing "glee at the prospect of failure of others" as much as he or she was commenting on how fun it is to say.