All the faux (i.e. white privilege) comments about it having a higher meaning are just like those who refuse to understand the link between monkey chanting/banana skins and racism towards black footballers.
Genuine question: are there actually people who refuse to understand monkey chanting and banana skins as racist? If so, that's shocking, but I don't see that as analogous with this situation, and think it's pretty disingenuous to imply that Stuart is comparable to some EDL type on the football terraces. I am not white myself, and I don't think it is at all helpful in the fight against racism to conflate what seems to have been a thoughtless mistake with neo-Nazism.
All those people who think it is an over reaction _what do you think of his response when someone said that the PC brigade will call him a racist?
Perhaps he thought that would be such a ridiculous distortion of his Tweet, the quote, and his intentions, that it was laughable?
If so, I do think that was very naïve of him, and that anyone who uses Twitter needs to be far more careful than he was about what they post, and who they engage with (not because this individual happened to be black, but because there are lots of people out there who delight in wielding the power to get others sacked).