In my time (and where I am from) they would have been thrown out of train at the first opportunity, by other passengers.
The problem is, they are getting away with this kind of behaviour because no-one dares to confront them, for various reasons.. the main reason probably is a lot of trouble for confronter - if you acted, you may have been accused by police or whoever for abusing them, and not the other way around.
The world is getting upside-down these days..
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