Edward - with respect, what you say is quite correct. He was driving legally and committed a couple of minor civil offences (such as trespass)which could be pursued through the courts if it was worth the money, which it isn't. That's not the issue here. Nor has anyone taken the Frontera as anything other than a identifier for this individual.
The point is, the man was driving like an arse. Subsequently he was rude (perhaps in the face of Fi's provocation). Whether he was in a Frontera, Vectra, rickshaw or pair of woolly socks he represents us all so he shouldn't rise to her bait.