You make a lot of unfounded assumptions. I gave that question as an example of reasonable use of AIBU, not as a political statement. You have no knowledge about me, my background, my politics or my activism.
And so what if middle class women suddenly become aware of an issue and take to their keyboards? Are they not allowed to have opinions or ask questions? Does having a privilege background mean you should not engage with issues important to those less privileged than you?
As ever, if you do not like a thread, ignore it. If you feel it inappropriate, report it. If you think they are wrong (or ABU), correct them. If you think they are uninformed, educate them or point them in the right direction. All these only if you want to engage, of course.
But who are you to dictate that a person may or may not post in AIBU? YABVU.