I've not read the article but wanted to share my similar story.
My friend and I met up for a cuppa before toddler group and when it was time to leave DS (3) was making a fuss as he hadn't finished all his drink yet. Being a toddler he only decided that it was necessary to finish it all once I had put DD (6 months at the time) in the sling, had my coat on and my friend and her DS was ready.
DD decided that waiting about was not what she wanted to do so started crying... a lot. I was trying to calm her down and hurry DS along when an old man sat at the table behind us said 'oh, just give her a good hiding'.
I know that not everyone wants to listen to someone else's baby crying but its not as if I was having the time of my life either. A bit of patience and understanding goes a long way.