not really. Some are very special specimens of people and you can tell quite obviously, others are on the other end of the scale.
The other thing I forgot to mention, and was the only slant on the holiday, is that Americans are very rude, abrupt, abrasive and arrogant in their attitude towards staff. Not saying its all Americans obviously as it'd be a massive generalisation, but the ones we saw on holiday were. I don't want to claim its a race thing as there's no evidence of such, but you know when it's just in someone's persona? Basically they just love to boss the staff around, all black staff I add. The way they'd ask the staff for things was mad. Very bossy - instead of just politely asking for something, it's more like 'get me this... Get me that'. Like what you'd see a master do to a slave. It was disturbing at times.
Oh, and most of the Americans we saw at our resorts were fat. Obesely so. Some morbidly obese.