>I am from different country and most of the words are gender neutral which in US pretty big deal like (landlord, guys - which is gender neutral in our country).
Ask your hetrosexual male friends how many guys they have slept with.
I would imagine response will illustrate "guys" is less gender neutral than might think.
Some locations they use "y'all", some use "you guys". It's gender neutral in that sense.
In the sentence you gave, the context wouldn't be gender neutral because you said "slept with".
If you enter a room and say hey guys, it's neutral. If it's all girls you could say hey gals, which would be fine, either works.
I can't imagine anyone other than liberals that would be offended by a blanket statement of "hey guys".
It's really a stupid thing to get hung up on. It's like searching for something to offend you.
It doesn't make sense until you realize the goal. What you're doing is creating arbitrary rules to form a kind of censorship via social pressure because you can't censor speech legally.
Ask your hetrosexual male friends how many guys they have slept with. I would imagine response will illustrate "guys" is less gender neutral than might think.