I have personally no objection to women putting on make-up in a train. I just assume that they are had to rush to catch the train and are on their way to an important appointment.
My colleagues and I were once on a train that was so badly delayed that in order to be on time for a performance we had to change into our costumes and do our full theatrical make-up in the train. I would honestly have been offended if anyone had complained.
I was brought up to think it bad manners to eat on a train, unless you offered the rest of the passengers a share of the food. No-one does that any more, but I think if I was sitting facing fellow travellers, I would say, "I hope you don't mind, but I am absolutely famished, so I must have a sandwich." I would, of course, expect the other person to reply,, "No that is quite all right".
I honestly feel people are becoming too precious, for want of a better word, if we no longer can eat or drink in a train.
I like many others object to loud telephone or other conversations, noisy children, passengers with their feet up on the seat, and people pushing and shoving.