re: I have heard that "The Patriot" is terribly inaccurate and offensive to the British

It's not total trash but it's deliberately bubble-gum to appeal to the masses...as a Summer blockbuster popcorn movie.

I don't know why the Brits would really take that much offence (as they would say) to it. That's like Cliff Clavin getting upset over how inaccurate The Postman is.