I have found out in life that women can also be dependable, fun to hang out with, and not "complicate things."

Using "bro" is offensive because it excludes others by their gender. It's an awful exclusionary term and you shouldn't think it funny or ironic. You're not taking this serious. I'm guessing because you haven't any idea of how soul crushing it can be to see this kind of behavior in the workplace when you're at the other end. It fucking sucks.

I'm not sure where you got this idea that bro means "friend". To me it's more like what the urban dictionary says http://www.urbandictionary.com/define.php?term=bro

1. Obnoxious partying males who are often seen at college parties. When they aren’t making an ass of themselves they usually just stand around holding a red plastic cup waiting for something exciting to happen so they can scream something that demonstrates how much they enjoy partying.

2. An alpha male idiot. This is the derogatory sense of the word (common usage in the western US): white, 16-25 years old, inarticulate, belligerent, talks about nothing but chicks and beer, drives a jacked up truck that’s plastered with stickers, has rich dad that owns a dealership or construction business and constantly tells this to chicks at parties...