First of all you should probably read this. You can even read my gratuitous tilt at DB major in the comments.
And then you should read this.
I too have some Riedel glasses, and I’ll be honest I like them mostly because they are elegant and don’t have the horrible thick rims of machine blown wine glasses. But beyond elegance and certain very basic principles, I have never bought into the whole spiel.
And this link gives an excruciating debunk (for Riedel at least) of the whole affair.
That humourless “valley people” as a German friend once called the Austrians (he actually said “wally people”, but no matter) should take umbrage and threaten legal actions makes them even more ridiculous than their spurious claims.
As Ron Washam has asked, publicise this idiocy far and wide; tweet it, Facebook it, Instagram it or whatever, but for God’s sake, let Riedel know how off the target they are.
For your amusement, or bemusement, this link shows their choice in decanters. Mamba? Eve? Boa? Classy!