Yeah, and while the example does have merit, language often evolves. I could say "he seems quite gay" and the meaning is going to slant more towards orientation than mood per the last several decades.
"Hey you guys" has actually become pretty gender-unspecific in use over time. My daughters call everyone "you guys" , and I pretty much use the same term with them. It's not to indicate they're masculine, but has become a catch-all for "all of you" in modern language.