Accents are different depending on the region. It's the same way in the US, like compare a Northeastern accent to Southwestern. You would see the difference outright. You can go to different countries and understand the language in one area but be confused as hell in another.

Britain is not a single country in the way the US is. It's a collection of countries. Saying someone has a "british" accent is not like saying an 'american' accent, it's like saying a 'north american' accent, as though all people from Canada down to Mexico have indistinguishable accents, histories and cultures. OP was definitely in the right.

I'm from the south of England, and I have the "stereotypical British accent", which is the same one Americans usually hear because it's the accent that the BBC likes its actors to have, and I assume that's where you get any and all British TV in the States.

If she meets someone from Somerset, she'll change her mind. Or Liverpool. Google 'scouse accent' and 'west country accent'

The use of "British accents" and "American accents" are often spouted by idiots who are too lazy to do nothing but generalise who or what they're talking about. There are distinct differences in accents throughout most countries, and they seem more prevalent the bigger the country is. I remember when my aunt and uncle left England to live in Spain, the next time I saw them, I asked how much Spanish they'd picked up, and after a few little tests, I learned that some words are pronounced differently in different areas, and you have to know which ones change and where. I don't know how accents develop, but it's ignorant to refer to them as one singular national accent, because chances are, each country has a myriad of different accents.

Not just trying...she does in fact look stupid.

I'm British with a British accent. Like I'd say people from New York & Tennessee have American accents even though it may be different. Ydi

When non British refer to a 'British accent', they usually mean the almost posh, well spoken voice, where every syllable is pronounced eloquently. This is commonly heard down south, especially parts of Hampshire.

You're a jerk. Stop trying to be a smartass, you know what she means

Technically you are 1/2 right, there are many dialects to the UK, like there are here, in the USA; however a TRUE accent, as you seem concerned with the matter, is only affected on a person speaking a language different than their native tongue. If you are from Spain, speaking English, you have a Spanish Accent; French speaking English is a French Accent; British speaking English is a dialect--differences in tone & some words, but the same basic language.