I don't think OP is arguing that social media is leading to the denormalisation of racism; I think OP is noting that, whatever other madness we are dealing with

I don't think OP is arguing that social media is leading to the denormalisation of racism; I think OP is noting that, whatever other madness we are dealing with in this day and age, there are some issues in the past that were crazy, abusive, exploitative and damaging, and that they have gotten much, much better over time.