I suppose "brogrammers" might be a target audience, but the concept of the tool itself is pretty good for just about anyone. Shame about the name.
Not everybody that wears shades, doesn't take life seriously and speaks with an accent is misogynistic, crass, less mature than you and difficult to depend on.
That's not really fair. To a bro the word just means 'friend' - somebody that's dependable, fun to hang out with and that won't over complicate things.
Those descriptions seem more in line with the tool.
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.
"come on now ladies lets move the tour along" "Who you calling 'lady'!?"
Guys really is just a historically ingrained shorthand. I don't think I've ever heard it used in this sort of context to cause harm. Using "Ladies" in this way, on the other hand, could cause yourself harm.
As much as anything, I've heard many women refer to mixed gender groups as "guys" or "dudes". A lot of this "definition creep" is actually due to women themselves. Probably this is because the male identity is viewed as a source of power, and women seek this out and aim to identify with it.
In other words, I don't think the use of "guys" generically is being driven by sexist men. I think it's being driven by blurring of gender roles and definitions, and adoption of these generic terms by women.