addressing the students

"Hey you Guys,..." i am sure everyone who has ever had a class in any school has heard their teacher address the entire class in this way. yet did you know that as a teacher we are not allowed to address our students in such a manner? it's technically not politically correct for starters, and by addressing other gendered students in such a manner might be considered offensive to most. so instead of addressing your students in this manner, we now have to try as hard as it might be to address our students now as "y'all", "folks", or "everyone" so that it remands gender neutral. others might think this absolutely ridiculous, others might feel that it's appropriate. how do you feel about it though?