The reference to a baby being left to cry whilst people are eating a meal.....
I know on many threads there has been advice given similar to this that with a difficult baby sometime you just need to let them cry so you can eat or shower, that a mum needs to look after herself first so she can look after baby.
Who knows people's reasons for doing things? Or how often it happens? The baby could of been like my first and just screamed all day every day for the first four months no matter what I did, maybe they just wanted to sit and eat a civilised hot meal with others for just one night for 30 minutes.....a remark such as "teaching it a lesson" could simply be venting their frustration, not them actually teaching it a lesson
As I said easy to judge but maybe trying to understand would be more helpful