Some reaction like this was bound to happen, what with the embarrasing "taking the knee". And Black Lives Matter being non-racist of course was OK but anyone attempting to promote White Lives Matter is a raving racist. Yer average man-in-the-street will only put up with so much pushing before he says "this load of bo11ocks is getting out of control" and he starts to rebel against undeserved criticism of him not parading through the streets arm in arm with some black stranger.
Whilst we are the subject of silly names, what about a dance troupe called........ Diversity, whose members are all black. I did think at first that my application was rejected because I can dance better than any of them.....
I'd understand people booing, but until we can gauge the collective mood on the terraces, I think it would be wiser to just carry on singing or start a pure football related chant as if you haven't noticed or, if you have to express disapproval, opt for the whistle (such as when keepers are wasting time). If this nonsense is still a thing at football grounds when fans return in significant numbers then you can bet the media will be looking for people who hold up "All Lives Matter" banners or whatever for public shaming.