I think the overall meaning is that saying "Good news for guys then", while not a false statement, isn't a complete one either. "Good news for guys and lesbians

I think the overall meaning is that saying "Good news for guys then", while not a false statement, isn't a complete one either. "Good news for guys and lesbians" would be more accurate. "Good news for folks in the market for women" even more so. I don't think she's in any way suggesting you're wrong, (and neither am I) she just wants you to remember that she exists as well and benefits from this too. I can't speak for her but I also see it as a slightly humorous addendum to your point.