Because it is wrong to judge
Be honest about what you're saying here, which is 'it's wrong to judge men '(in a way that causes them hurt feelings and to be rejected by women in some situations.)
You're merrily judging away about women who have had different life experiences to you and want to make different choices to you that you perceive as disadvantaging and being exclusionary towards men.
Try some Riley Dennis: I suspect Riley's line in 'it's fine to avoid penises if you're a lesbian who has been traumatised but you need to get over it as fast as possible for the sake of the lesbians with penises who need sex from you' is something that at heart you'd agree with.
When women shame other women for wanting single sex provision when they themselves don't, they are validating the removal of choice, they are validating shaming and deriding and emotionally blackmailing women into accepting disempowerment and their bodily autonomy, and they are making trauma and distress unacceptable to show, or share, or live openly.
That to me is one hell of a lot more wrong, it really is.