I don’t mind the sticky carpets. I don’t mind the shitty seats. I don’t mind other people making certain noises, eating etc. And if a person is looking at their phone then I don’t mind as long as that’s it, just looking.

What I do mind, what I absolutely cannot abide, what I find completely unacceptable is the person behind knocking my chair. Once or twice when first sitting down, or when getting up to go to toilet etc is fine. But that’s it.
There is no acceptable reason to keep on doing it. NO REASON.

“But I get numb and need to fidget.” Then sit behind an empty fucking chair.
“But I’m freakishly tall.” That’s your problem, but when you continually knock other people’s seats it is not their problem as well. Move to an aisle seat, or sit behind a seat that’s empty.

"But I (insert any fucking bullshit you want to try to bullshit about here). SIT BEHIND A FUCKING EMPTY SEAT. It’s that fucking simple.