I imagine this criticism comes from a handful of scorned men, with somewhat limited dating experience, and have become bitter towards all, based on the actions of a few.
It is very easy, from a few experiences, to label a group of people as the same, yet ignore the diversity within the group.
American girls are painted as delicate princesses that expect men to wait on them hand and foot.
But, in my experience, this does not hold true at all.
I see a lot of men online complain that their American girlfriends suck the money out of their wallet.
From the first date, the man is expected to pay for everything.
While I have met people with strong, sometimes extreme, political and social views, that is not her.
Of course, sometimes the language barrier extends beyond just a new way of saying words.
There are some words that are completely different in the US, and some that have entirely different meanings. Both of these are extreme stereotypes that completely polarise a hugely interesting and diverse culture.
She works hard for her money, and will often not To Brits, the idea of sending food back when it arrives is a big ordeal.
Most of us would rather eat whatever is put in front of us than face talking to the wait staff and asking for another.