Still deserves it if he was "just" teasing. Not everyone takes teasing in a good way, and if the OP doesn't know the guy well enough that he had no idea his father died (as a coworker!), he shouldn't assume that the coworker would take the teasing well. I don't go up to people I don't know and start teasing them about how they look, it's a good way to make someone very self-conscious or feel like shit because they might already have low self-esteem.

Especially if someone actually *is* depressed. There's no shortage of dumbasses who expect people with whatever form of mental illness to "just snap out of it". Also, OP's coworker could just be a goth who *likes* dressing that way.

God forbid people think about what they are going to say and if it's appropriate to say at all. "Stop wearing black it makes you look depressed" is not an appropriate way to voice one's opinion unless it's a good friend of yours, and since it is obvious the coworker is not a close friend/a friend at all of the OP, it's not appropriate to say it. If you ARE going to have the balls to speak your opinion no matter what, then this wouldn't be an FML. The OP would've just brushed it off with a shrug and went on with his merry way, but people who have even an OUNCE of empathy for a fellow human are going to feel guilty about coming across as a complete inconsiderate jackass. Therefore, you should think about what you're saying before you say it.