in the plural or non-countable, such as this case, "guy" is ungendered
Guys, this doesn't have to be so hard. Just check the authorship before commenting about the author! If you get it wrong and someone points it out, say "oops, I should have checked" and it's over.
Please don’t assume our gender when preaching to us about inclusive language.
Then you have limited E.
This, right here, is precisely why this issue is important. We have gendered pronouns that are so ingrained we try to pretend they're not gendered.
"All" is a _shorter_ and more inclusive substitute for "guys".
If you think this isn't important, just replace every occurance of "guys" that you see with "gals". If you're cool with that, good on you, but if you think for one second "oh don't say gals that might piss someone off" then, well, there's the kicker.