"If you're Maltese, and under 25, you're not allowed in"

Today I paid a bit more attention to the advert on my favourite Maltese radio station, Capital Radio. In fact it's about an "Evening of the stars" including Frank Sinatra and so on, at the Dragonara Casino. The phrase I was interested in, at the very end, was this: "If you're Maltese you need to be 25 years or over, and you have to show your identity card".

This means that if you're, say, Papua New Guinean or Iranian, you don't need to show your ID card. But the point is, how are the morality police at the gates of the Dragonara Casino going to recognise a Maltese citizen from an Iranian? A 24-year-old Maltese citizen, according to our friends from Capital Radio, could gain entry by NOT showing an ID card, and thereby being presumed by the morality police at the gates that they are, say, Argentinians or Albanians. Of course, said police could always suspect that a non-blond(e) person is Maltese, and challenge them to prove that they are not Maltese. The person suspected of being Maltese, however, could always claim that they are not obliged to show any ID card, since they are not Maltese but Albanian.

So, the situation regarding entry into the Dragonara Casino, according to the Capital Radio advert, is this. Blond(e) persons are assumed to be northern Europeans, and can enter without any problem, whatever their age, provided they don't speak any Maltese. Black persons and Asians are also assumed not to be Maltese, so, again not too much trouble for them, they are mature enough to enter the casino, even if they look younger than 25. But if you're young and have a Mediterranean complexion, then you're in trouble. You'd better prove you're not Maltese, otherwise your entry is barred. And, whatever your skin colour, if you look younger than 25, don't say a single word in Maltese, otherwise you will have given yourself away as a Maltese citizen, and therefore you're not mature enough to be allowed entry into the Dragonara Casino.

But then again, maybe the Capital Radio advert got its wording wrong (for a change). Maybe they meant that everyone needs to provide a means of identification. This would make it possible to enforce the discriminatory rule against Maltese nationals who are younger than 25. It still leaves the wide-open question of mixed Maltese-foreign young persons. Are these allowed to enter, or not?

Where are you, European Commission? Can Member States discriminate between EU citizens on the basis of nationality, or not? And if they cannot, what's to be done about this blatant discrimination?