In several English-speaking countries "guys" is not at all gendered (used universally by people of any gender to refer to groups of people of any gender), while "y'all" and "folks" are basically just not in the language at all and would just get you confused looks. I have no idea what "folx" means as this is the first time I've ever seen it.

"You guys" is just the most common form of the 2nd-person plural in American English. "Y'all" is strongly dialectal, and it sounds forced when someone who doesn't actually speak the dialect says it.

> Y'all

As a Texan it sounds jarring and wrong when said by a non-Southerner. A bit like a lily white person suddenly dropping into AAVE. It's just cringe-inducing and I would like people who do it as an affectation (rather than something they grew up saying) to not do it.

I feel it's retarded.

A quick search of my emails suggests that while I commonly use "everyone" and "y'all", I haven't used "you guys" in a business communication in...years

I don't think "folx" is going to be one of the recommendations, it isn't synonymous with folks anyway, so the replacement would be rarely make sense unless you were explicitly talking about particular queer or marginalized communities.

Extremely negatively