A big part of every memorial i ever went to was given to drumming it home that unless you were anoited you couldn't partake. And everyone would be watching the "strangers" as their turn came, ripples of horror would go round the congregation if they dared to nibble or sip(!)
... but seriously what is the problem? what does it matter? why make such a massive big deal about it? So long as the anoited have their nibble and glugs then dos it matter if anyone else does? Where please in the bible dos it say that you "mustn't" eat/ drink it???