I based my answer on the fact that Miriam Margolyes is a fine actor and supports a lot of causes that I do, whereas the geezer on a seat is just some knob that I've never heard of. I don't have any rational reason, but hey! Sue me!
Perhaps given she has demonstrated terrible attitude in every other element of this incident, maybe the reason she didn't get what she wanted initially was because she demonstrated the same terrible attitude during her initial request for the seat? Just a thought.
To his credit, it seems the youth demonstrated restraint in not retaliating after she assaulted him. Hardly the attributes of a 'knob'.
The worst bit of the incident, and the bit which for me tells me most about the woman, is her choosing to brag about it afterwards. I'm sure most people would feel even a little bit of guilt after assaulting someone over something as trivial as a seat, even if they were angry and made a misjudgement in the heat of the moment. This unpleasant woman seems proud of her actions and felt the need to boast to a wider audience, "look at me I didn't get what I wanted so I assaulted someone".
There's not even one word in the initial article that suggests the woman, at any stage, gave even an ounce of thought to anyone else's potential needs other than her own. "Me me me", from start to finish.
The only good thing about the incident is the knowledge that such an unpleasant woman lives her life in pain, and I know I definitely won't be offering a seat to her should I ever have the misfortune of sharing a station platform with her.