When I lived in BCN there was a certain reputation a type for British and German tourists who used the streets as a toilet. It struck me as odd that so many people seemed to view Barcelona as an "anything goes" type of city while the Catalan people are not that wild for the most part and drink socially but not to get drunk.

That is because it was and still is promoted as 'anything goes' in the UK. Google 'Stag Do Barcelona'.

My theory on british tourists is that people from uptight, repressed places are looking for somewhere to let loose. Granted the US is uptight too but we don’t have as much drunk hooliganism because we’re strict on alcohol too.

What are you talking about? The US has a huge amount of binge drinking at ages 16-22 and plenty of hooliganism, such as NFL games and holidays. I’ve lived in Barcelona and the only reason there aren’t as many drunk Americans is it’s far from most of the country.