Scenario- boarding had all but completed about 5 minutes prior. There were 3 left to board, myself and 2 open standby seats. I was at the desk, all others were seated waiting for T-15 for standbys to clear. No chaos at all.
I was having a conversation about the "you board you lose your upgrade" policy as GA was planning on upgrading a Y pax already on board. There was one F seat not yet checked in. I was #1 on GIDS. Conversation was cordial and not confrontational. Yes, I will report the GA, especially since she makes her own policy for a couple of different situations.
There was the T- gate skyclub right next door for the DM.