To be clear, interrupting the US ambassador’s speech was not right of reply. This was something done later.
F. Right of reply
Delegations should exercise their right of reply at the end of the day whenever two meetings have been scheduled for that day and whenever such meetings are devoted to the consideration of the same item.
The number of interventions in the exercise of the right of reply for any delegation at a given meeting should be limited to two per item.
The first intervention in the exercise of the right of reply for any delegation on any item at a given meeting should be limited to ten minutes and the second intervention should be limited to five minutes.
To be clear, interrupting the US ambassador’s speech was not right of reply. This was something done later.