To be honest, all this whitaboutery is a bit futile. The problem is within football fans, sports fans, & society as a whole, there's racism, bigotry still evident. We know it happens now, never mind 30 years ago.
Each club / section of society has its own problems, it shouldn't matter if its 1% or 50% of the support. If decent people are coming out & condemning it, then that's more voices that might educate & swing that percentage in their favour, so their shouldn't be 1 upmanship as a way of point scoring.
If you really are anti racist, but the player or club making the complaint makes you doubt that in anyway, then are you really anti racist in the first place?