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.
More importantly, it's not any sort of insult, it's a term people use when they're being friendly to each other, and even if we don't like those people there's not really any need to erect a barrier to its use. "Groovy" has been associated with the psychedelic-drug-using subculture, but we've had no trouble naming a programming language after it. This isn't like, say, "nigger", where it's virtually impossible to imagine using the word in a non-discriminatory way. We don't need to build this wall.
Of course this rant is irrelevant. I think it's silly that a term of endearment can offend people, but:
* when you're naming a software product, you don't get to choose the culture you release it into.
If saying "bro" makes some people uncomfortable, the bottom line is that it just makes a lot more sense to change it. There's virtually no cost to using a different name at this point, and there's plenty to gain by avoiding controversy.
A lot more people object to Groovy's "G-Strings", its name for interpolated strings, than the "Groovy" name. org.codehaus.groovy's Project Manager even introduced a new operator called "Elvis" (the null-coalescing operator) in an attempt to redefine the meaning of "G-String" from the item of clothing to a string on Elvis's guitar to deflect objections but no-one's fooled.