This topic was discussed on the Jeremy Vine programme earlier this morning , and the point was raised about what was DB's intention when he posted the picture.
They were discussing whether it was still racist if he had no intention of it being perceived as such. It seemed to be that his intention was the crucial point.
That surprised me as I thought incidences like this depended on whether someone, even just one person deemed any comment or internet post to be seen as racist.
It made interesting listening though, as various differing aspects of it were discussed, rather than just the usual 'it's disgusting - 'he's a vile racist' type of usual, predictable comments.
However, it was such a stupid thing to do, and I don't think he will be missed by many people following his sacking.