Unfortunately it mirrors much of society in general these days and not giving a stuff about anyone else. As somebody as pointed out, there are ways to ask 'please could you sit down when you can, as I can't see' and "effng sit down you ......."
Just as there are ways to do your best and give the person behind a bit of respect and sit down if you need to.
All seater stadiums bring these problems to the table - many years ago stood in the back of the Chaddy or any other terracing and a 6ft 4 man mountain stands in front of you with a minute before kick off, you could shuffle along or bellow down his ear for 10 until he became fed up of you and moved! It's harder sat down.
There are dingbats everywhere and 6 pints of John Willies, a couple of them sambuka things and a smoke on what they fancy, tends not to bring the best out of the dingbat race - their time will come - until then we grin and bare it (unless 1 stands in front of me of course!!)