Others have mentioned that the British are not portrayed any worse than the Colonial British.
that's definitely good to know. unless you mean they're all portrayed like arseholes
it is true
in American movies, villains are
1. Evil British
2. Evil Russians
3. Evil Muslims
But I think the real thing you have to remember is that the colonists WERE part of Britain, in very real ways. So if you try to paint all British as comically evil, what does that say about the Colonists?
And both sides committed atrocities, I agree.
But I just don't let the portrayal in hollywood (or anywhere) bother me like that because historical accuracy in films is so incredibly rare to begin with..
oh, I'm not on the barricades, mate. it's just that I've become a lot less tolerant about such bollocks. Blame Mel Gibson!