That racism stuff didn't work. It was too preposterous. So there's an even more recent charge: not mere racism, but worse - parochialism! See hereAnd yet so many people - including in Scotland - are lining up trying to bribe/flatter/terrify Scots into rejecting the escape hatch out of this that we have. It's really worrying.
The latest is that wanting to be independent from England (and stay in the EU) is racist.
The charge to which the SNP has offered no coherent answer is that of parochialism; that by choosing nationalism we forgo what used to be called international solidarity but might now be termed cosmopolitanism. At root, the Nationalist contention is that a bus driver in Shettleston has more in common with Sir Brian Souter than with a bus driver in Salford. The connection, though, is not genetic but geographic; it matters to the SNP which side of the Tweed the bus is being driven on.