Its not something I would have thought of doing. And I would be upset in the same situation if I wasnt asked 1st. Think there is over reaction for sure.
If baby was upset, hungry and tired 30 mins can seem a life time, shoulda been a phone call made to the mum, but I also wouldnt have left a child without trying to feed 1st if I knew time was coming, probably wouldnt have left baby at all- depending on age a bit. So many varients to take into consideration, but losing friends over and act of kindness? all be it not such a great thing afterall, suggests they werent really real friends in the 1st place and again- wouldnt have left my child