"That terrible version of While Shepherds Watched, as sung in some Yorkshire pubs which, in many cases, are excellent establishments..."

Which version (of the 30-odd) have you in mind? One virtue of the multiple versions is that no brain power needs to be expended on remembering the words, so there's more brain power left for the parts.

But I do hate one that is often sung in the pubs, the one about Kris Kringle with his sleigh; largely because KK is otherwise unknown in Britain, where the person on the sleigh is Father Christmas / Santa Claus himself, not "Santa Claus's man".