Thanks for the answers.
@Glen: Thanks... I have seen "guys" used like that, yes. If I had thought about that, I wouldn't have been so puzzled by "man".
But in Spanish, using the masculine to talk about a group where at least one member is not a feminine object (or person) is because in Spanish we don't have a neuter gender, so we use the masculine. Nowadays it's different but many years ago, the words "imported" from foreign languages used to be always masculine because the public didn't have to know whether it was a feminine or a masculine in their original language. (Nobody used to say "la chance", but "el chance", for example.)
This is quite different from the fact that the latest fashion of women calling themselves "güey"/"wey" is rather wrong, since this used to be an insult exclusive for men.
I would like to add that women don't call each other "hombre". "¡Hombre!" is an interjection (almost meaningless and just used for emphasis) that doesn't address the other person as if it did by their name.
@Rusty: Thank you!
I certainly don't take it personal, but it sounds strange.
