The problem with DUblin is the short taxi to the runway. Cabin was not obviously ready and to start taxing to the holding point in the first place blocking all departure was not a great idea. However crew may not be familiar with that in Dublin. He did however ignore 3 ATC instructions which should be looked at.No where in the world would you get away with that. 2 minutes is a along time in any airport with multiple departure and arrivals and I find it very hard to believe the airport was not busy as it is one of the busiest days of the year as the 25th the airport is closed. I think the answering a phone comment was him getting cabin secure from cabin crew.