I just find generally people making assumptions about my sexuality infuriating, it is nobody's business but mine, it is rude.
I've been assumed to be straight, which was kind of an insult, and I have also felt like I have been outed by strangers because of my non-straight choices.
Having struggled with what my sexual/romantic orientation is, I am not ready to go and label myself as one or the other in the world.
As it happens only trousers for men fit me, this would be the case with my body type regardless if I was straight, gay or into ducks, and yet it gives shop assistants the right to go and stick me into the lezzer box, which would be ok if projecting my inner dyke was my primary motive, but it was not, it was mostly about the fit.
The girl in the shop suddenly is all flirty with me, because she assumes I am gay, when in a different situation she would just have ignored me. It felt kind of forced.