Well I don't know about the UK, but here in Australia, there were many cases of anyone of Asian-looking appearance getting racially abused and physically attacked due to COVID-19. Like how seriously retarded is that. I wouldn't say that the 'bias' doesn't exist anymore today.
Son might not get vilified much cos he is a popular player. I guess everyone cops criticism if they have a shit performance.
I doubt it was anyone of Asian-looking appearance but that was also a very specific reason for people being idiots. To try and then extrapolate that to other areas of society is a big stretch.
But yes it was very dumb (not a fan of using the word retarded) by anyone who would do that.