I think if you get racist abuse, you should go to the police. It is, after all, illegal.
Incidentally, Diane Abbott is worse due to stating the nature of her tweet. Miliband is just an idiot who can't read before he tweets.
So, a racist comment is a criminal offence in the UK?

And if you, Corroded were black and I sent you a tweet calling you 'a lazy blind, black bastard', you would have every right to go to the Police and report me?
On the other hand, if you Corroded were white....and I'm stretching my imagination here and making wild assumptions.....and I were a black man and called you 'a lazy blind white bastard'?
What recourse if any, would you have?