I wish this were true, but it simply isn't. If a group is full of white cis heterosexual guys and someone turns up with a random screen name and says nothing about themselves, everyone assumes they are also a white cis hetero guy even if they're not. The implication is "you have to conform, and if you don't then you don't belong".
The reality is that for many people, their mere public existence is seen as a political statement. Often times asking for the most simple of accommodations or changes is seen as "being vocal" or starting an argument.
I'll give you a hypothetical. Let's say a group of developers is all-male, and a leader starts off every meeting with "hey guys". Then, a developer who is a woman joins the project. They ask that leader "When you say it like that it implicitly excludes me, It would mean a lot to me if you said 'everyone' instead." I think that's a pretty reasonable request, it asks very little of the leader (to change one word), has no impact for everyone else, and means a lot to some. But to many, many people that would be viewed as "suppressing speech" or "weaponizing oppression".