If I'm in a mixed group down the pub I won't at all be surprised if somebody (usually female) walks up to the table and says "hey guys" as a greeting, intending to include male, female and enby members of said group.
If I'm on the internet I'm not going to try and use "guys" as gender neutral because I fully expect I'd be misunderstood by a decent percentage of people reading if I did.
So I wouldn't say people are necessarily pretending, it's entirely possible they're just used to it being neutral and forgetting that for a bunch of people it very much isn't.
That's socially though - when talking about people I've slept with, I acknowledge I'd expect people to read 'guys' as only referencing the male-identified ones. Though I'm more likely to use 'dudes' for that purpose myself, because confusion around 'guys' can go in both directions.
A lot of people say this, and I WANT this to be true because I don't know of a similar term that really works. I don't think most women agree.
When my best friend came out as trans, I struggled to come up with a good way to refer to everyone as a group in a "hey everyone" kind of way. I eventually realized it's a stupid concept all together and walked into the room of my now mixed gendered friends while shouting "SUP CHODES!".
