There was and still is a shit ton of racism on Reddit, among other -ism hate.
People like to hate on groups they deem “other” or less than. r/Freespeech is stuffed to the gills with transphobia and homophobia, for example. Anyone else remember r/FatPeopleHate? r/The_Donald hasn’t been gone that long. etc etc etc.
There is no such thing as “good racism.”