It happens.
I've never been to the US, but when I visited Europe I found that everything (bars, night clubs, and so on) closes before 2 am.. And that's shit. The last time I returned home at 2am I was 14 years old. People need to have fun in their lives, that's why most places in Argentina last until 4-6 am.
Now I'm 18 and I've been arriving home between 7 and 8 for the last 2 years.
In this country the relationship is far easier.. you always say hello and kiss in the chick (at least to women); then you dont need to worry about anything.. we dont have such "she-is-a-bitch" thoughts: women also want to get laid and when a normal person wants something, s/he goes get it.
If you go dancing and become "overly agressive", as you say, you'll never get sued or anything.