Londoners are only really grumpy on the tube if you are not following the commuting rules (let people off the train first, move down the carriage, don't put your bags on the seat etc, etc).
I know some people moan about it, but it's a valuable form of social control which keeps London moving and running smoothly and helps everybody get where they need to go.
I've lived outside London for 10 years and I do miss it. I was trying to get on a relatively busy tram yesterday and even though there was loads of room inside all the people on there were just standing gormlessly looking at the people trying to get on and not moving down. Even when I got on, I managed to move a little further down, but it was pointless, because the next girl down just stood looking at the space and not moving into it, apparently incapable of making the link between the people who couldn't get on and the whacking great space in front of her.
They never, ever let people off the tram first and start trying to push on. And my personal bête noire is people who take literally one step off the tram, then stop and sort their bags and coat out right in front of the doors and all the other people who can't get off because they're in the way! How I miss being allowed to just shove them out of the way! They hold up trams, delay people and it's bloody infuriating. And it never stops, in London few people do it because they know they'll just be shoved out of the way.
A lot of people around here moan to me about how rude people are on the tube in London because if they try and get on before people get off they get pushed back out or if they won't move up the carriage people shove past them. And I'm like, 'Yes, they're being rude to you because you are being rude and inconsiderate to other people.
So I hope Londoner's keep on being grumpy, they're doing a great job.
And breeeeeathe. Can you tell I had a stressful commute this morning.