I think the more important question is... do you want to be?
There are a number of reasons that people mock the misfortune of others, whether by their own making or as a result of happenstance. For most it's a matter of schadenfreude, there's a kind of cathartic pleasure from "not being that guy". Knowing that there's someone worse off than you creates a kind of stress relief, the whole, "No matter how bad my life is, at least it's not that bad."
But like with anything you can enjoy it recreationally or you can become a spaz. When you become fixated to the point of psychological addiction then it becomes a problem, then you become an A-Log, a weeb, a fantard, or whatever other community specific term you like. In any form... nobody likes a spaz.
Another reason is for the sake of being evil/bad/mischievous/anarchistic. It's a fun role to play and when taken lightly in the form of trolling or shit posting it can likewise be an enjoyable form of stress relief. But, just like with the spaz types, if taken too far you go from being a troll to a fuckwit.
A fuckwit wants to feel bad/evil to the point of becoming a try-hard edge lord, often to the point of actually breaking laws. One of the best recent examples is Tyler Barriss. And, once again... nobody likes a fuckwit.
So in any event don't be a spaz or a fuckwit and you're fine.