“You guys” is the plural form of “you” for most speakers of colloquial American English, and is completely ungendered, in an empirical sense: if you observe native speakers speaking naturally and colloquially, you will find that everyone who uses it (regardless of gender) uses it consistently to address groups of multiple people (regardless of gender). It’s derived from the noun “guy”, which is indeed often gendered.…
You can approach a group of women and say " hey guys", that is fine.
To a group of men," hey gals", and that is not fine.
"Hey guys" to a mixed group, why... You've now 'elevated' the women to men so everyone is ok with it.
It all implies that being a woman is somehow lesser. And so that is why I'm going to stick to everyone or folks.
Although I don't begrudge or ask anyone to change.