After further review of what "sarging" is, and reading your prior posts and getting a bit of a profile on you, I don't blame the three dudes for threatening you. Every action has a reaction. Lets put a sales analogy to work here:
You're doing the "call centre" approach. Sales by numbers. The problem with this approach is, it has a VERY LOW success rate... and you'll ultimately piss people off. You may get 2 out of 50 "sarges" to become interested (and I'd question the sanity of the ones it works on). The odds are the majority of them will hate your guts for your brash approach and not give you the time of day. Of this group, some of the girls may actually do something about because what you did made them uncomfortable. Sound familiar? It looks like the girlfriend told the boyfriend and he and two friends made you sh@t your pants. Well deserved. You may want to take a look at how you do things and not be such a dick to women.
On the other side of the spectrum there is the professional approach. Put in your time, do your research, and take a well thought out approach in getting to know the girl. If you do this, your closing rate is higher and even if it's not a 'sale' right away, at least you're tolerable and may have a chance down the road... hell, even if it doesn't work out, you were nice enough to be referred to another one of her friends.