I'm going to go with...
Sequence of events is true....
... But.....
I reckon the captain put his hand out to the drinks making a bad joke, with no intent to drink, and likely in the preboarding moments with no passengers on board... The Cabin Manager pulled him up on this and they bickered a little... Later in the flight the Captain twisted the knife with the poor joke along the lines of..
Cabin Manager: Would you guys like anything to drink
Captain: Yes "Bring me wine" haha guffaw guffaw etc.
No flag carrier management would have come to this decision otherwise.
I'm not the sort to defend all pilots in all circumstances... Would be interesting to know if she was a known trouble maker by the point of conflict.
My theory is backed up by the report that the first officer and not the captain had the altercation