I can't abide the argument that getting abuse is part of being famous. That doesn't make it acceptable. That argument makes it sound like it's okay for someone to hope that he kills himself, because he's 'famous'. It's hideous regardless.
More than likely, the scummer who posted that to Collymore wouldn't have the gall to say that to anyone in the flesh. It's abuse, famous or not. Twitter has given people an almost-anonymous platform to say incredibly hurtful and offensive things; things they wouldn't ever say in real life, guaranteed. The whole place is filled with hatred and threats. I'm surprised it's not policed better than it is.
It doesn't really matter if you're famous or not. If you're on Twitter talking about football, chances are, at some point you're going to have some smartphone wielding virgin barking at you like he's John fecking Rambo. Having a scan of certain Twitter feeds this evening, and it seems that any non-Liverpool fan claiming that Suarez dived is on the receiving end of torrents of abuse. What the feck is wrong with people? These angry tossers need to switch off their computers/phones and go outside once in a while.