If someone told my 7 y.o. to get off a seat and wasn't elderly I would have said No. If they want a seat they can have mine but I would have also made her ask nicely and then I would have stood very close to her in the aisle LOL. And y'know what? I'd be quite happy to pay for an adult seat for my children and show them that we have done so. I think its dangerous for children under a certain age to stand. As for the altercation I would have more than likely acted in the same manner, pointed out the cameras in the vicinity and told her I would be making a police report.

Its not hard to show some manners. I hate it when people automatically assume because a certain demographic has given them grief in the past that they automatically treat them all with contempt. Its disgusting.