I'm American, and my other two friends are Egyptian and Indian.Will we be killed by chavs if we visit England?
No, Chavs like Americans, its who they try to emulate, kinda.As for your brown friends, most of the UK is teeming with them. All in all, you'll blend right in.
Chavs are a minority and I wouldn't worry about it. You get uneducated thugs in any part of the world and I don't think chavs are that different than the ghetto scum you americans have to deal with.
"British" people hate whites. Stay away from the UK, it's very dangerous with the whole honor killings thing.