The key word in verse 5 is majrāhā, the cup’s customary route. With al-yamīnā, the poet argues not merely that he lacked a drink, but that the serving order was violated.
Verse 6 strengthens the complaint by denying that he is the least worthy of the three. A seemingly small incident becomes a claim about social standing. The poem’s sarcasm must be read in its own cultural context.