I think this is possibly true, the more I think about it
Macca is a Scouser of course and they have a jokey way about them, it would be typical of a Scouser to test someone's sense of humour in this way, in my experience of Scousers!!
And Macca is like Royalty really, maybe you don't expect them to be jokey with you, maybe Mika really did think Macca didn't know his name OR that he was actually being rude to him!? Mika is used to dealing with abuse and taunts and pisstakes and it can make you defensive especially when caught on the hop like this by an ultra famous person.
I don't know if I'm expressing this properly (I've just woken up from a power nap ) but what I'm trying to say is, I can understand how Mika reacted.
I don't think Mika failed the sense of humour test, though If he did, then I have no sense of humour either, as it would have got me!! But perhaps he failed the Scouse Initiation Test v:naughty: