Chopos y pariguayos are two different animals. There are chopos who are t?gueres, and pariguayos who are chopos. But you don't have to be one in order to be the other.
As a founding member of DR1's Pariguayos Unidos, I find it offensive to be considered a chopo.
If I ever move back, I'll start a Pariguayos Ateos club. The sign will say: chopos, t?gueres, and short-haired freaky people need not apply.