the 'black face' tradition pre dates the Black Face Minstrel by at least a hundred years !

Whilst is is just about possible to allow for a non-racist reason why a bunch of ill-educated beer-soaked clod-hopping agricultural workers from darkest 18th century Shropshire would dance with blackened faces (and maybe even excuse if there were) for so-called educated people to do so in this day & age by way of revisionist reactionary cosplay and expect their non-racist folk doctoring to be taken seriously is an idiocy of the highest order.

if a few of these PC pillocks did just a little research , life would be a lot simpler

What we see today is in no way traditional practise but a particular fashion of a minority of revivalist folk-enthusiasts dating back no further than the 1970s.