Is this actually true? I used to think it was a myth and as a girl myself I dont like to stereotype other girls. I was born and brought up in the UK, but as my parents are from other countries and work jobs that involve travelling I have lived a lot in them too (both around Europe and America). Please note this is not a diss on English girls I have met several lovely ones! But maybe English culture is generally quite "cold" in some sense (not always bad) and because girls are competitive between themselves this increases it.
Both me and my non-English friends (male and female) have noticed that English girls can often be really stuck up, both when trying to make friends with them (they're cliquier than American girls) and even to random strangers etc. Of course, all girls can be gossipy but English girls are often much harder to get to know, and sometimes when guys (even guys they know) hit on them they overreact in the way they respond or are mean for no reason. I wouldn't call myself American but I can see why English guys find it easier in the US sometimes.
They can also be quite hostile to strangers - for example, in the library or on the bus, even if you mind your own business (both me and my friends have noticed this) girls in England will often glare at strangers for no reason, esp. female strangers, or (if in a group) start whispering nasty comments amongst themselves. The other day, an old homeless looking woman sat down in the library, and she wasn't really bothering anyone but some of the girls sitting behind me took a picture of her and uploaded it on Facebook. I am very quiet when in the library and on my own but some of the (presumably English) girls who work there are always staring/glaring at me and coughing loudly while rolling their eyes. Not that it matters but I dress perfectly normally etc.
Maybe this is partly to do with class and English society's focus on it, we have noticed that "working class" English people (while stigmatised) can actually be much more laid back than the kinds of girls who wear brands like Hollister everywhere and roll their eyes at the librarian for telling them not to drink iced coffee there. I am from a very "well off" background and often wear brands etc. myself but I don't like to think of people in terms of being middle class or rich etc., but maybe English society still expects that and it leads to people being snobby. Girls can also be catty generally so maybe that is why me and my friends (a lot of whom are girls) have experienced this.
What do you think?