Guys doesn't bother me, I know it bothers some people but I'm fine with it.
Boys on the other hand, it's fully exclusive.
Here's where this breaks down for me. If someone who was non-binary wants to post this exact thread and says:
"Boys doesn't bother me, I know it bothers some people but I'm fine with it.
Guys on the other hand, it's fully exclusive."
How would you react? Would you argue that they are wrong about it or acquiesce because it's really not a big deal. Let's say you do the latter and then promptly that person leaves the forum forever.
If I was in a direct conversation with you, and I remember your wishes, I would not use "boys". I don't know that I use the term in the first place. However, in a forum full of disparate opinions picking one incredibly minute word to police for someone is unreasonable, when that word is not offensive on its face.