Haha, good one. I am a brit living abroad and even I cringe at times. On holiday (yes Tenerife) overheard a couple moaning to each other on the bus trip about why the signs couldn't be in english on the roads! Hello! Same holiday I pretended I could not speak english with my friends as the table next to us had the foulest mouthed people I have ever heard, but what made it worse was the fact that they did not seem to realise that they were offending people; to them it was normal speech.
Long socks in sandels with shorts, red knees from the sun, as well as anything else that sticks out. Talking louder because they think that makes the poor person not speaking english understand better, etc etc