Look, travelling into and out of London at rush hour is hell on earth for everyone, including the commuters.
And the reality is that if you choose to travel into and out of the city at rush hour then you take the chance that it's going to A, be busy, B, you may have to stand, C, not everyone is going to be in a jolly happy mood because they don't want to be squashed into a train like sardines any more than you do, but, unlike you, they have no choice since they have to make that journey at that time in order to be at/get home from work.
But in life you will meet numerous people, some nice, some not so nice, and in general most people's attitudes to you will depend on your attitude to them. Entitled travellers with bags on seats can be asked to move them, but that wasn't a point of discussion here. If there had been bags on seats you could have asked one to move, given you were able to tell people to go to a different door how is it you couldn't ask someone to move their bag?
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If I travel into the city at rush hour then I do so with plenty of time to be flexible e.g. To allow for crowds on the tubes, and I also do so in the awareness that I may be abused for taking my guide dog on to the escalators and having to block the way behind me so he can run off. But on the whole most people are decent, polite, and even helpful without being asked for help.
If however you come across as entitled people will be less inclined to want to help you or even be courteous towards you. Why should they?