But if any man seem to be contentious, we have no such custom, neither the churches of God. - 1 Corinthians 11:16
Upon reading this verse in the context of the preceding passage, I get the impression that 1 Corinthians 11:16 is saying that if anyone resists the idea of women covering their heads (whether that be by a veil or with long hair), treat it as though that custom did not exist, namely, one does not need to practice it.
However, no Christian commentators have said the same. Most say that the "custom" refers to being contentious, although this does not seem to make sense with the flow of the text. Also, "custom" is a noun, while "be contentious" is a verb phrase, and so it makes no sense to use "custom" to refer to "be contentious". Other commentators say that the "custom" is women praying and prophesying with their heads uncovered; however, this also does not seem to make sense of the flow of the text, and the main subject of the passage is women covering their heads, not keeping them uncovered, although the two subjects are, of course, closely related.
What points in 1 Corinthians 11:1-16, and verse 16 in particular, justify these two interpretations, if there are any? Is there anything which may support my interpretation?
In other words, what is the custom of verse 16?