[Straight white guys] are in no position to properly assess the damage felt by said minorities

Why single out straight white guys and group all minorities together? Do you think most white woman empathize more with black people then Eminem?

You're drawing lines on race gender and sexuality. On a societal level, those lines carry some meaning. On an individual level, those lines can be meaningless. This is equivalent to applying the mean of a distribution to all of the data points in the distribution. That's incorrect per basic statistics.

the right decision in most situations is to STFU or show support.

I don't participate in public social media. Being PC doesn't bother me, but this did a little but. At present, I perceive your worldview as violating fundamental pillars of nature (central limit theorem, Fermi-Dirac statistics to name a few). Why should I STFU and show support?

Wouldn't it be better for me to ask questions and listen? Of course, and you agree.

Did you not make this post to facilitate discussion? You're post is basically asking me "hey straight white guy, you need to shut up. Please tell me why you don't need to shut up." You're facilitating discussion, which is what people should do.