Let's assume I am very well versed in other pertinent domains of knowledge, like social psychology and the tendency for people to get mad as hell about social justice issues and leap to ugly conclusions that fit their SJW narrative about evil in the world that can be conveniently lumped under a one word heading, like sexism.

Let's further assume that this is actually actively counterproductive, so it's reasonable to point out that correlation is not causation and it's unhelpful to insist on a particular conclusion you cannot prove.

I already noted he's right to be outraged at the situation and critical of the black box nature of the decision. I'm just not comfortable with him ranting that it's clearly and obviously due to sexism.