At least that's the conclusion I came to after spending this weekend watching DS (7) at rugby coaching, and then a 'football party'.
At rugby the kids made lots of noise, sure, were rough (but respectful of each other), played by the rules (mostly). In the clubhouse afterwards they were boisterous, but mostly polite and well-behaved.
At the football party a bunch of boys the same age were aggressive, rude, pushed and shoved the little ones (some only 4 ) and at the 'party tea' I couldn't believe my eyes... kids firing party poppers in each other's faces, pouring whole bowls of crisps onto their plates, throwing food and drinks around. It was like a zoo.
It may well be a controversial generalisation, but the two sports definitely encourage different attitudes don't they?