Communion is not a matter of judging anyone "worthy" or "unworthy" by any standards by which we'd rather be egalitarian.
This is a matter of a person's own confession of commitment to the Body of Christ.
The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?
For we being many are one bread, and one body: for we are all partakers of that one bread.
...
And when he had given thanks, he brake it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me.
After the same manner also he took the cup, when he had supped, saying, this cup is the new testament in my blood: this do ye, as oft as ye drink it, in remembrance of me.
For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come.
How can someone honestly participate in this communion with those around him if he denies being a member of that communing Body?
That's like inviting someone to take the oath of enlistment into the military--but not for "realsies."