I don't feel like this is true.
The comic where one character identified as "white" isn't punching down at black people. There are no people of color who identify as white. He is punching up at insane corporate rules that make the color of a person's skin important when it comes to hiring: an inherently racist thing.
The comic where a character identifies as a "birthing human" isn't punching down at trans people. It's punching up at corporation rules which need a specific reason on why an employee can go home or not. It shouldn't matter why you're feeling unwell, go home if you're sick.
Corporate policies on its employees should be as broad as possible and not target individual minorities and their intricacies.