A little story for you, this happened last week
My terminally ill auntie [45yo] is full time carer to her 4yo grandson. She came to visit last Wednesday [she lives in Manchester, we live S/W Wales]
Both had been on the train 4hours prior to a old lady getting on, 20 minutes after getting on,old lady shouted at my auntie "make that child be quiet, and he should not be walking up the carriage either". My auntie replied, "you have been on here 20 mins, he has been sat here 4hours, on a boiling hot day, he is playing with his cars, not to loudly, if you want him not to, then you quieten him down"
My auntie was terrible upset when she got off the train. She told me her grandson was only brrrrrrrrrrrr ing his cars across the table, nothing major, noise wise, and his walking across the carriage, he had gone to his bag to get a juice bottle.My aunties leg [cancer in hip] had been giving her a bit of jip, so she sent him to get his drink
The grandson had spent the whole time after the lady shouting, turning his head towards her, giving her funny faces 
My auntie is in two-minds about coming down here again now, yet she loves it here, she visits 6-8 times a year, she would move here if she could be the Grandsons mum lives up there, and has since had another child.
Id love to see the nasty old lady