1 Corinthians 11:20-22

When ye come together therefore into one place, this is not to eat the Lord's supper. For in eating every one taketh before other his own supper: and one is hungry, and another is drunken. What? have ye not houses to eat and to drink in? or despise ye the church of God, and shame them that have not? what shall I say to you? shall I praise you in this? I praise you not. (KJV)

Then: Early congregations did not have a specified public building for meeting. The people gathered in the homes of those with the largest houses. Baker (p. 168) describes these villa style homes with one large room, a triclinium, for nine to ten people to eat while reclining on couches while another room without a table, an atrium, could accomodate thirty or forty people to eat while standing or possibly sitting. Laborers and slaves arriving late would find that all the food was gone, already eaten by the rich, leisurely, early arrivals who had been "grazing" (Magness, class notes, 10-17-09). Obviously, some even become drunk. Henry calls their actions corrupt. By being inconsiderate to the poor, caring only for their own food lusts, and indulging in a desire to drink, they disdained communion between themselves and Christ, let alone communion between themselves and other believers.

Now: For the most part, manner and mode of communion is settled as an event limited to the Lord and a single believer. Rarely does it involve a sense of group worship. A whole meal is not involved - probably a major result of Paul's teaching here. Community meals do occur as potlucks where the Lord is included only while grace is being asked. That part is no longer a problem. However, to the extent that the act of communion involves personal attitudes towards fellow believers, problems can prevail. When rich evaluate the poor as unworthy associates, when laborers disdain the value and decisions of CEO's, when classmates exclude unpopular students according to intellect, clothing, or behavior - fellow believer's all, then the Lord's death is devalued. Spiritual growth requires the setting aside of personal likes and dislikes. Those saved have a new task - that of looking to the lost, to draw them in, and to promote changes in attitudes, behaviors, and wisdom. Communion is the act of relating to other believers and Christ at the same time.

Extra source: Cornerstone Biblical Commentary 1 Corinthians (William Baker), 2 Corinthians (Ralph Martin & Carl Toney), ed. by Philip Comfort. Carol Stream: Tyndale House Publishers, c2006.
Commentary on the Whole Bible Acts to Revelation Vol VI by Matthew Henry online at http://www.ccel.org/ccel/henry/mhc6.iCor.xii.html