but are other nations as bad?
Generally, I would say no. I travel mainly on German, Dutch and Belgian airlines. I've occasionally come across groups having fun and becoming loud, but without any aggression. If the crew ask them to turn it down they generally apologise and comply. The only aggressive groups I have ever personally witnessed have, with only one exception, been Brits. And that is just about anywhere. The Brits are by no means alone, but they are the biggest culprits by far.