That will be because the ATC folk are well trained professionals and enormously aviation aware - unlike the guys in the plane on their version of a road-trip.
They seemed surprised they couldn't route direct through the London TMA to Shoreham.
Their Australian chum at Shoreham didn't understand the UK classifications of ATC service either - he managed Basic and Traffic but then went off-piste with Separation.
It really isn't rocket science and I'm sure the majority of pilots aren't so arrogant as to go flying in another country without learning the differences in service and procedures.
They couldn't even understand something as simple as 'Pass your message'! Hey Toto, I guess we're not in Kansas anymore..............