It's been a while so I don't remember anything concrete, but I remember characters being described with a strange amount of detail in racial or ethnic features, like height or nose shape. I don't think he ever explicitly describes any race as superior to others, but some of the passages felt like it was going to devolve into some weird analysis of skull dimpling or something.
I searched it up a bit, and apparently Card is pretty vehemently homophobic. Which really sucks and is really strange. It sucks because i do enjoy his books, and they were honestly part of what got me into sci-fi. It's really strange though since the moral of pretty much every single book of his is understanding, empathy, and compassion.