Black Lives Matter could consist predominantly of wealthy white people and it would remain coherent as a movement.

Similarly: there simply is a profound gender imbalance in technology, and celebrating progress toward correcting that imbalance is reasonable regardless of the underlying economic story.

It is reasonable to have concerns both about the structural privileges afforded to wealthy people in technology and the gender gap. What's not reasonable is to use one issue as a cudgel to beat back concerns about the other. If you think the tech gender gap doesn't matter, you'll have to argue that directly.