I agree we are not in medieval Europe anymore, and I have not experienced the camino as an ultra conserative environment. But I did witness racist, homophobic and sexist behaviour/comments on the camino. Not on a large scale, but I realise it is well possible that I only saw a fraction of it, as such comments are not directed at me.
As sexism, racism and homophobia occur in normal society, it also happens on the camino. I see no reason to create fear about this for future walkers, but I also do not feel the need to be defensive and claim that "these things do not happen on the camino".