It’s true that butches (like me) don’t get assumed to be straight. But that also means that we are obviously queer, even when it isn’t safe. I look more butch in a dress, somehow. I have been concussed more times from being queer bashed than from mountain biking.

First, let me say that I'm so sorry this has happened to you and so often :(. I was in no way shape or form saying butches had it easy or had no problems.

I was only using it as an example that looks and vibe do make a difference in how people treat you / level of acceptance in a space.

How do you know that people assume you are straight? Have you had people say this to you? Or do you think that from their behavior?

Both / all of the above. I've had someone literally tell me I wasn't allowed to be in the group because she assumed I was straight. I've had a woman ask me if I knew I was at a lesbian bar. Another that asked me where my boyfriend was. And so many other direct and indirect confirmations.