The more he protests, the more people are likely to believe there was something in it. Bong is being dignified and not dragging it all through the mud again. The only time he responded was when Rodriguez said the truth came out, when it didn't. It was not proven, which is not 'not guilty'...
There is also the factor that Bong grew up in France, and it was a reference to garlic. Race doesn't necessarily apply to skin colour.
The definition of racism is to refer to what a person is, rather than who they are.
He may well defend himself when he appears by producing a valid French licence.
I'm not saying he will, but it won't be the first time a guilty sentence in absence has been turned over.
He hasn't appeared in court to defend himself yet. I'm not saying he isn't guilty of all three, but the magistrates did only check to see if he had a UK licence.