I can understand being happy about a player being injured if you're to face said player's team. I'd love Ronaldo to be injured when we play RM. Being happy about a player being injured because he turned down Barcelona means you have a quite sandy vagina.
And I remember this is not the first time this discussion has taken place. And while certaintly wishing harm / finding joy is someone's else injury isn't a class act, it's hardly like people are wishing harm on some poor African kid / wishing a player gets cancer like some people make it out to be in these discussions. At worst it's people wishing that someone who earns more in a week than people do in a year breaks a leg. Don't make it more dramatic than it is.