Did they even watch it lmao. Camina Drummer, one of the biggest badasses on the show, is a woman who is explicitly pan and in a polyamorous relationship. Not to mention Holden casually mentions has eight mothers and fathers, and the DNA from all of them. And one of the major characters from season 3 is a gay woman. You have Amos whose sex drive is a physical need he takes care of on occasion but who is uninterested in romantic entanglements. Like there are non-hetero non-"vanilla" people all over the place and no one is bothered in the slightest.
Also the main relationship on the show (Holden-Naomi, center two in the image) is interracial.
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Real "the curtains are just blue" moment.